So we all know only the Secret Keeper can give the whereabouts of the people/place they are protecting. We also know that if the Secret Keeper dies, anyone they told in turn becomes Secret Keeper. But how does a Secret Keeper change hands without the original Keeper's death?"An immensely complex spell involving the magical concealment of a secret inside a single, living soul. The information is hidden inside the chosen person, or Secret-Keeper, and is henceforth impossible to find -- unless, of course, the Secret-Keeper chooses to divulge it" (PoA, Flitwick)
In case you haven't guessed, I'm working on a Sirius fic, and I need figure out a way that Sirius could make Peter Secret Keeper after the Fidelius Charm was cast.
The Potter's originally made Sirius keeper. Dumbledore knew, and he or Flitwick was probably the one to cast the spell to begin with. Sirius, James, Lily, and Peter (and Voldemort) were the only people who knew of the switch, since everyone later believed Sirius had still been secret keeper at the time of the Potter's death.
If Sirius had simply told Peter the location, that wouldn't have been making him Secret Keeper, exactly. And Peter had to be Keeper in order to be able to tell Voldemort the Potter's location.
So here's the options I came up with:
a) They cast the Fidelius Charm all over again, this time making Peter Keeper
(only this time Sirius or Lily or someone could do it without Dumbledore/Flitwicks help)
b) Sirius goes to see Peter and they do some sort of transfering spell to change the Keeper, so Sirius is in on the Secret but can not give its information to anyone. (this was his whole reason for switching anyway, since he was afraid the Death Eaters could force it out of him and he was a more obvious target)
or do you have another suggestion? (I know this is a complex spell, but the simpler the better as far as for my story... >_>)