(a) In canon, it was not the houses that were protected, but their location, i.e. information. The Fidelius keeps information secret, not an object hidden.
(b) I think that was ingenious, in the same way as Dumbledore hiding the Philosopher's Stone inside the mirror was ingenious. The cool thing is, Alexandra can't reveal any of the identities because she doesn't know them. The dangerous thing is, if she becomes aware of the identity of anyone in the Thorn Circle, she is the only one in the world who can share that information with anyone. Thus the constant check-ups by Diana Grimm.
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Re: The Fidelius Charm
Date: 2011-09-03 02:39 pm (UTC)(b) I think that was ingenious, in the same way as Dumbledore hiding the Philosopher's Stone inside the mirror was ingenious. The cool thing is, Alexandra can't reveal any of the identities because she doesn't know them. The dangerous thing is, if she becomes aware of the identity of anyone in the Thorn Circle, she is the only one in the world who can share that information with anyone. Thus the constant check-ups by Diana Grimm.
I don't see any contradiction of canon.