It’s now been definitively established that Peter Pettigrew was concealing the location of the Potter family’s house in Godric’s Hollow as their Secret Keeper.

This means that the house was invisible and Unplottable to anyone who was not the Secret Keeper (Peter), inside the perimeter of the Fidelius Charm when it was cast (the Potter family themselves), or told later on by the Secret Keeper (like Bathilda Bagshot and Sirius Black, and presumably also Dumbledore). As such, if the charm was still intact, the following people should not have been able to see the house at all:

  • Hagrid when he came to pick up Harry from the ruins
  • the Muggles that responded to the explosion (police/firefighters/paramedics)
  • the wizards and witches who enchanted the house to be a memorial invisible to Muggles
  • Hermione, when she and Harry visits many years later (and all the wizards and witches who visited until then)

The fact that they could heavily implies that the Fidelius Charm itself had been broken. Why did the Fidelius Charm on the Potters' house break? asks why that might be, but the accepted answer doesn’t really give an answer, other than that the inconsistent descriptions of the Fidelius Charm makes it impossible to know.

Jeff’s answer to the same question, however, a most ingenious solution based on this quote from chapter 17, “Bathilda’s Secret”, in Deathly Hallows:

… and now his destination was in sight at last, the Fidelius Charm broken, though they did not know it yet …

The wording in that quote is not necessarily precise enough to know for sure—‘broken’ might just mean ‘overcome’ in this case—but if taken literally, it means that the Fidelius Charm itself had been broken (i.e., undone), and by Peter himself.1 This would explain an awful lot. There’d be nothing strange about all those people who saw the Potter house throughout the years.2 In fact, almost everything that is odd and bizarre about that night and the Fidelius Charm would become clear.

Normally, though, I should think that undoing a charm or spell would be the sole prerogative of the caster—not much point in protective spells, after all, if anyone can break them. If Peter was able to undo the Fidelius Charm on the Potters', either the Secret Keeper must be considered equal to the caster with this charm, or Peter himself must have been the caster.

Is there any canon confirmation, apart from the quote above, that Peter should be able to undo the Potter Fidelius? That is, either that a Secret Keeper can always undo ‘their’ Fidelius; or, alternatively, that Peter was the caster of the Potters' Fidelius?

1 The alternative, that Voldemort could somehow undo a Fidelius charm once he was told the Secret, seems a bit far-fetched. Why would he even want to or bother? His goal was to kill Harry, and once Peter had given him their location, there’d be no point in actually undoing the Fidelius charm for him.

2 We have to assume he broke it immediately before Voldemort went there, though; otherwise someone else would be almost certain to notice that there was suddenly an extra house in the middle of the street, and there would presumably have been a fair bit of commotion about that. Even assuming this, it’s still an open question how all the Muggles in Godric’s Hollow managed to deal with the fact that a half-ruined house suddenly just popped up out of nowhere one October night. Some large-scale memory charm work would almost have to be involved there.

  • Interesting point about breaking spells normally being the prerogative of the caster... I'm not sure I agree, when it comes to protective spells. I would think they would be modified or broken by their holder, which may or may not be the same. After all, one would want the most powerful and competent protective spells around - which might mean people hire or contract out, instead of cast their own. Makes more sense to me to have the spells designate who/what holds them (secret keeper being the extreme version), than have people trust hired ward-casters to have access to everything.
    – Megha
    Feb 21, 2016 at 14:01
  • @Megha You make a good point. For example, it would make sense if Harry were able to undo Hermione’s protective spells around their tent (though I don’t recall offhand if there is ever any mention of that happening). Feb 21, 2016 at 14:02
  • It would make sense, someone might want to give or deny access to whatever is warded based on who they trust, not only who can cast. Although I was also thinking about the blood wards - held to some kind of verbal contract or precondition between Petunia and Harry, anchored in the physical house, and can't be maintained by whoever cast it if the contract doesn't hold (or perhaps broken if it does). Secret keeper would be the holder and the achor, and perhaps the only person who could break the Fidelius
    – Megha
    Feb 21, 2016 at 14:12
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    Speculation: if the spell was cast to protect "the place where Lily and James are hiding" rather than a specific address, then it would have broken of its own accord once they were dead. One possible reason for doing that is that a house suddenly disappearing might have alarmed the Muggles. (Granted it was made invisible later on, but that was after the "gas explosion" if I remember correctly.) They still wouldn't be able to leave the house, because then they wouldn't be "hiding" and that would also break the spell. Feb 22, 2016 at 4:35
  • @HarryJohnston It wasn't made invisible later on as such, just bewitched to look like something else to Muggles. The answer to the question linked in the first line gives very good evidence that it was in fact the house, and not the location, that was concealed. Besides, the whole point was to protect Harry—why protect Lily and James’ location, but not Harry’s? Feb 22, 2016 at 12:33

4 Answers 4


No. If it were possible for a Secret Keeper to break the charm, the Death Eaters would have expected Snape to do so with the charm on 12 Grimmauld Place. The tongue-tie curse prevented him from giving them the secret (or gave him an excuse not to do so) but could not have prevented him from breaking the charm entirely if it was in a Secret-Keepers power to do so, and Voldemort would surely have known as much.

As for why the charm protecting Harry's family was broken, it all depends on how the spell was constructed. Keep in mind that it protects a secret, not a person or thing, and presumably must be phrased accordingly. So far as I know there is no canon evidence on this point, but there are a number of possibilities that would explain the spell breaking, for example:

  • Where are Lily, James, and Harry hiding? (After the attack, they're not in hiding any more.)

[Note: they would still be unable to leave the house without the invisibility cloak, since that wouldn't constitute "hiding".]

  • Where is Lily and James's house? (After the attack, it belongs to Harry.)

On the other hand,

  • Where is Potter's Cottage? (But is there any canon evidence that their cottage did actually have this name? And if they named it this themselves, is it still really the house's name after they've died?)

  • Where is Number 8, Potter's Lane? (Between 7 and 9, probably, or 6 and 10 depending on the street layout; either way, it isn't exactly a secret, so probably can't be protected.)

[Note that I've chosen an address at random, since there doesn't seem to be a canon address.]

Note that the only other canon example we have of use of the Fidelius charm was to protect 12 Grimmauld Place. In this instance we actually do have a clue, the note Dumbledore used to reveal the secret to Harry:

The Headquarters of the Order of the Phoenix may be found at number twelve, Grimmauld Place, London.

It is clear that in this case at least, the secret must have been phrased along the lines of "where is the headquarters of the Order of the Phoenix" rather than "where is the Black family house" or "where is number 12, Grimmauld Place". (This can also be seen by the fact that in Deathly Hallows the Death Eaters were able to know where to go to keep a watch on the place.)

It seems reasonable to suppose that the Fidelius Charm protecting the Potters was phrased similarly.

  • 1
    Your edited-in point about Snape is a very good one, +1 for that. The only difference between that situation and Peter’s is that Snape was only a second-generation Secret Keeper, and if those can still divulge the secret to others, I don’t see why they should differ from first-generation Secret Keepers in other ways. (Whether there is such a thing as second-generation Secret Keepers at all is still not established beyond all doubt, but it does seem more likely to be the case than not.) Feb 24, 2016 at 6:53
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    Note also that in (I believe) Deathly Hallows, the observation was made that if he hadn't known the secret, Voldemort could've looked in the window of the Potters' cottage and not seen that they were there. That lends credence to the thought that the actual secret was along the lines of, "James and Lily Potter and their family are hiding at..."
    – Deacon
    Sep 27, 2016 at 14:12
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    Good points. One thing that seems problematic though (in terms of "what is the secret") is that #12 Grimmauld Place seems to have still remained protected by Fidelius even after the Order of the Phoenix stopped using it as their HQ. It feels like JKR started out with the idea of Fidelius as a way to hide secrets in general, and then the concept changed over the course of the series to be more about hiding locations in particular.
    – wyvern
    Sep 27, 2016 at 19:08
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    @sumelic: it's a bit of a stretch, but in-universe I think you could argue that it was still their HQ, they just weren't using it any more. As far as I know it was never replaced; for all we know, if they had designated a new HQ the charm on #12 would indeed have been broken. (But they didn't really need one under the circumstances; there were no major actions to be planned and it would probably have been dangerous to meet in large groups, even under magical protection.) Out of universe, on the other hand, I agree that this is just a minor inconsistency. Sep 27, 2016 at 20:25

Note that my following comments assume that the place is the secret, not the location of the Potter family.

Harry Johnston made some excellent points regarding the unbreakability of the Fidelius Charm. However, whether it is breakable or not, it should certainly be able to be nullified by the Secret Keeper, if he or she wishes. For instance, assuming James and Lily had lived and Voldemort had been defeated, James might well have asked Wormtail to place the following advertisement in the Daily Prophet:

Mr. and Mrs. James Potter wish the Wizarding community to know that their residence is located at Number Nine Potter Lane, Godric's Hollow.

... to borrow the fictitious address used by Harry. Theoretically, this would effectively nullify the Fidelius Charm by making the secret public knowledge.

However, please also note that, even if the Fidelius Charm were in effect, Harry would likely not be affected by it, since he "knew" where the Potter residence was from the time when he lived there as a young child, although since (at that time) Wormtail was still alive and Secret Keeper at the time, he couldn't have told Hermione (although this begs the question of whether he could have taken her there).

Additional thoughts:

  1. The destruction of the Potters' home was the result of a powerful curse. Could this have broken the charm, similar to the way the use of Sectumsempra made it impossible to reattach George's ear?

  2. Does the Fidelius Charm weaken with the number of people who know the secret? I.e., if Wormtail, as Secret-Keeper told enough people, would the charm have weakened to the point of breaking?

Final (editorial) thoughts:

  1. I've always thought that James was rather an idiot to not make himself Secret Keeper, as Bill did with Shell Cottage. If he had done this and stayed inside the bounds of the charm, then Voldemort could not have found his family.

  2. As an out-of-universe thought, the Fidelius Charm (as well as all other magic in the Potterverse) seems to work exactly the way it needs to in order to move the story along.

  • I don’t think there would be any reason why he shouldn’t be able to bring Hermione to his old house—after all, the Fidelius Charm doesn’t stop you from simply walking past a protected place. He didn’t know where in Godric’s Hollow his old house was, and it was quite by coincidence that he saw it. He should still have been able to do what he did if the Charm had been functional—all he said was, “Look… look at it, Hermione”, which doesn’t give away anything, really. What he wouldn’t have been able to do is tell her what he was looking at (and she couldn’t see). Sep 27, 2016 at 15:23
  • You are correct. At the time I wrote my reply, I was making the unspoken assumption that the place itself was a secret, not the fact that they were there (I've since noted this). But is unplottability necessarily a part of the Fidelius Charm? For example, 12 Grimmaud Place was also unplottable and had muggle-repelling charms. As I noted in a comment on a different answer, in (I believe) Deathly Hallows, it was said that Voldemort could have looked in the window and not seen the Potters. That would imply that he could see their cottage whether he knew the secret or not.
    – Deacon
    Sep 27, 2016 at 15:49

Maybe the Fidelius Charm doesn't actually render the location physically invisible, maybe it just makes it psychologically unrecognizable. For example, prior to the breaking, Voldemort would be able to go to the Potters' house, see it and know that it is a house, yet never be capable of consciously thinking "That's the Potters' house - that's what I am looking for!". He could even ask a passerby to point to the Potters'​ house, and look where that person is pointing, yet be incapable of registering that that house is the one pointed to.

From another perspective: maybe the Fidelius Charm acts sort of like the 'Somebody Else's Problem' field from "Life, the Universe, and Everything".

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    Can you cite a source which supports this theory?
    – Null
    Sep 27, 2016 at 20:22
  • It does do this to some degree, as the books mention. Could you add some quotes?
    – Adamant
    Sep 27, 2016 at 20:27
  • Trouble with this is that Harry literally cannot see the headquarters at Grimmauld Place when he first gets there. And we see Muggles being unable to see the Leaky Cauldron, their gaze jumping straight past it. Sep 27, 2016 at 20:31

There is a simpler explanation. The charm was broken because the one who cast it, Dumbledore, broke it. His motto is "For the greater good", and for this good he created a villain whom he could use to justify pushing laws and regulations that he needed, and then the created a hero that could be used to defeat the villain.

If you don't believe me, ask yourself where did Tom Riddle learn about Horcruxes? No school literature would refer to it, but he knew to ask Professor Slughorn about it.

Why didn't the Potters hide in Hogwarts or at the headquarters of the order? Because they were bait to lure Voldemort out.

Why did Snape overhear a private teacher interview for divination position? Why would he have been there? Why did he take only a part of the prophecy to Voldemort? Because he was an agent for Dumbledore and followed his orders.

Why was Harry sent to the Dursley's? The so-called protection is something he never needed, since the Dursley's were never attacked. Even then the only time he was in danger with Dementors, they were perfectly able to attack him so if there was some protection it was on the house itself, not a very useful thing.

The simple fact is if you stop falling for the book's assurance that Dumbledore is some goody two-shoes, you will see him for the shrewd manipulator he is, he killed Grindelwald to assume the position of hero, and when he started losing influence and prestige from that he raised another villain, Tom, to fight and eventually defeat.

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    Whilst a nice theory in principle this seems to contradict quite a lot of canon and as such this is mainly head canon rather than anything more substantial.
    – TheLethalCarrot
    Jul 10, 2019 at 17:34
  • I don't believe you because all your questions are specifically answered in the books. However, I like your very interesting alternate answers and would've been cool to see within the story in the form of a V sympathizer trying to discredit Dumbledore.
    – silkscrim
    Mar 13, 2020 at 8:24

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