Theories: R.A.B.
Emma writes:
My theory on R.A.B. has to start in the fifth book: Harry, Hermione, and the Weasley family are cleaning a certain room in the Black mansion on the summer break before school starts. While cleaning that room, Kreacher walking in and out of rooms and taking “important” things that he doesn’t want thrown away,the group comes across a load of junk, including “a heavy locket that none of them could open” ( pg. 116 US version).
Then on their Christmas break at the Black mansion, Hermione puts a Christmas present in Kreacher’s “room” where they see a pile of shiny objects! One of them being the mysterious locket none of them could open? As it turns out that locket isn’t so mysterious!
Fast-forward to the sixth book, Harry learns about the only thing that can destroy Voldemort for good, his seven horcruxes, six objects or living creatures in which Voldemort placed a bit of his soul, the seventh part in Voldemort himself.
At the end of the sixth book Dumbledoore and Harry discover that a locket is one of the horcruxes but when they finally do come across it, it turns out to be a fake.
My theory is, that R.A.B stands for Regulus Arcturus Black, Sirius’s brother.
My guess is that Regulus Black joined the Death Eaters not knowing what thier plan was exactly, once he found out, he wanted to get out of it. But of course you can’t just walk out on Voldemort, no, no, no, you die if you walk out on him.
My guess is that Regulus stole the locket, being a Death Eater he knew where it was, and he hid it in the Black mansion, replacing it’s space in the bottom of the cauldron in the cave with a fake one, which Harry and Dumbledoore found.
Regulus was killed obviously but the locket remains in Kreacher’s little stash!!!!!!
I’m not J.K. Rowling but, I think that at the begining of the seventh book, Harry will go back to the Black mansion and find what he thought was junk in Kreacher’s “room”, Kreacher was finally a use for something!