Harry Potter and the Deathly Hallows Part 1 solves the mystery of R.A.B. in an anticlimactic scene that neglects to address the sacrifice of Regulus Arcturus Black, one of Slytherin’s greatest unsung heroes. J.K. Rowling’s Harry Potter series, made up of seven novels and anthologies of additional Wizarding World content, is widely known for its rich characters and interconnected plot elements. Everything in the Wizarding Universe is connected, and elements often reappear with unexpected importance, down to seemingly insignificant secondary characters. One such character is the mysterious R.A.B., the author of a note to the Dark Lord found inside a fake version of Voldemort’s Horcrux, Slytherin’s Locket, by Harry Potter and his friends.
In Harry Potter and the Half-Blood Prince, Harry, Ron, and Hermione discover that the Horcrux found in The Crystal Cave and recovered by Harry and Albus Dumbledore was a fake. When Slytherin’s Locket was opened, there was only a mysterious note inside. The note signed by the unknown "R.A.B." explains how the author discovered Voldemort’s secret, found the real Horcrux, and intended to destroy it. The trio had no idea who R.A.B. was or if they succeeded in destroying the Horcrux – and if not, where Slytherin’s real locket could possibly be.
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The early chapters of the Harry Potter and the Deathly Hallows booksolve the mystery of R.A.B. Harry, Ron, and Hermione take refuge in the abandoned Grimmauld Place, former home of the Black family and headquarters for the second Order of the Phoenix. Here the trio discovers that the mysterious note’s author is none other than Regulus Arcturus Black, younger brother to
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