I'm confused about the story of Draco Malfoy's mother Narcissa Black in Harry Potter and the Methods of Rationality.
In chapter 47, Harry learns that Draco says that Draco's stepfather Macnair says that Draco's father Lucius says that Headmaster Dumbledore has burned Draco Malfoy's mother alive in her own bedroom. That chapter also says that Draco's mother is called Narcissa (the same given name as in Harry Potter). This sounds like an important plot point so the truth about this has to be revealed later.
This isn't resolved until close to the end of the book, in chapter 120 titled “Something to Protect: Draco Malfoy”. I am, however, very confused about that resolution, since it leaves a lot of things implicit. Let me first recap what the chapter says explicitly.
That chapter first mentions that there existed a letter with secret instructions for the ultimate weapon to destroy Lucius, if his political power gets so dangerous to the Order that there is no other way to fight him, but that this weapon should not be used “until the whole war hung in the balance”.
We then see a woman named Nancy Manson regain her true memories. She has lived as a Muggle for ten years, but now she remembers she was a witch. Her memories are awoken by a Scottish witch, and she sees a “boy, with short white-blonde hair and wearing […] dark robes trimmed in green, staring at her with his jaw dropped and eyes wide and beginning to fill with tears”. Nancy says the name “Lucius” in the end. The chapter also mentions that Nancy had a dream to move to Australia.
Here's what I surmise from this.
- The boy with the white-blonde hair is presumably Draco, since this is a chapter about Draco. But the short hair confuses me, because I have an image of Draco with long hair from the Harry Potter films.
- Nancy is presumably Narcissa, since they have a similar name, Narcissa's story wasn't resolved up to then, and Draco finding her mother would certainly make her eyes fill with tears.
- I presume the Scottish witch was Professor McGonagall.
- Someone has hidden Narcissa to protect her after the Dark Lord has first fallen.
- This plot element may be a nod to how Professor Dumbledore offers Draco to hide him and his mother from the wrath of the Dark Lord in Half-Blood Prince chapter 27.
- Hiding someone by erasing her memory is clearly a nod at how Hermione hides her parents from the final stage of the wizarding war in Harry Potter, especially with that mention of moving to Australia.
- The story about Professor Dumbledore burning Narcissa alive was false, although Draco has honestly believed it. Either Lucius has invented the story, or he had it as a false memory, or perhaps Macnair has lied.
- The letter tells that Narcissa is alive and hidden, so the ultimate weapon is holding her hostage and blackmailing Lucius.
Are these points correct? Even if they are, there is still a lot unanswered. In particular, who has arranged to hide Narcissa this way? If it was Lucius himself, the Order couldn't know about this, so the letter wouldn't exist. But if it was Professor Dumbledore, then who invented the story that he has tortured the innocent Narcissa in that terrible way? Such a story sounds like a politically stupid move for Dumbledore. Further, what did Lucius himself believe about his wife?
I'm sorry if the above sounds like multiple questions, but really I just have one overall question: what's the true story of Draco's mother Narcissa?