5

“So Black was the Potters’ Secret-Keeper?” whispered Madam Rosmerta.
“Naturally,” said Professor McGonagall. “James Potter told Dumbledore that Black would die rather than tell where they were, that Black was planning to go into hiding himself . . . and yet, Dumbledore remained worried. I remember him offering to be the Potters’ Secret-Keeper himself.”
(Harry Potter and the Prisoner of Azkaban - Chapter 10)

Reading the above passage from another answer led me down an interesting train of thought: Sirius was going to go into hiding, and convinced the Potters to entrust Peter because he himself was too obvious a target.

But what if Sirius had made James his own Secret-Keeper and gone into hiding simultaneously? For that matter, what if Lily & James had been each others' Secret-Keepers?

  • 2
    Their souls would get sucked into a black hole. – Adamant Mar 30 '16 at 3:57
  • In retrospect, my linked answer is probably wrong. I would edit it, but that would make it too similar to the other answers. – ibid Mar 30 '16 at 13:25
2

Probably to the second, maybe to the first.

Clearly someone can be Secret-Keeper for a dwelling that they themselves spend time in. Bill , for example, is the Secret-Keeper for the location of Shell Cottage, where he resides.

“How are they protected?” asked Harry. “Fidelius Charm. Dad’s Secret-Keeper. And we’ve done it on this cottage too; I’m Secret-Keeper here. None of us can go to work, but that’s hardly the most important thing now. Once Ollivander and Griphook are well enough, we’ll move them to Muriel’s too. There isn’t much room here, but she’s got plenty. Griphook’s legs are on the mend. Fleur’s given him Skele-Gro—we could probably move them in an hour or—"

There can certainly be multiple Secret-Keepers for a given secret.

Mr. Weasley had explained that after the death of Dumbledore, their Secret-Keeper, each of the people to whom Dumbledore had confided Grimmauld Place’s location had become a Secret People in turn.

“And as there are around twenty of us, that greatly dilutes the power of the Fidelius Charm. Twenty times as many opportunities for the Death Eaters to get the secret out of somebody. We can’t expect it to hold much longer.”

It would seem as if there is nothing standing in the way of Lily and James being Secret-Keepers for the same location. At the very least, if say, Dumbledore were the Secret-Keeper for their location, and they were the only other ones who knew of it, then if Dumbledore died they would presumably become co-Secret-Keepers.

Why did they then choose someone else to be their Secret-Keeper?

Perhaps they wanted to go out occasionally, and neither of them wanted to be able to reveal the location of the other (assuming that torture or threats might work). Certainly they chose Pettigrew because he would be less conspicuous.

But yes; it seems likely that for two people who never want to leave their house, they could both be Secret-Keepers for the same location.

With regard to the first instance, nothing seems to stop the sort of recursive Fidelius Charm mentioned, but on the other hand I know of no statements from Rowling that say it is possible.

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