"He looked at the serpentine S, inlaid with glittering, green stones: It was easy to visualize it as a minuscule snake [...] concentrating on the letter S, imagining a serpent, while the contents of the locket rattled like a trapped cockroach. It would have been easy to pity it, except that the cut around Harry's necks still burned [...]The golden doors of the locket swung wide with a little click. Behind both of the glass windows within blinked a living eye, dark and handsome as Tom Riddle's eyes had been before he turned them scarlet and slit-pupiled."

"To the Dark Lord
I know I will be dead long before you read this but I want you to know that it was I who discovered your secret. I have stolen the real Horcrux and intend to destroy it as soon as I can. I face death in the hope that when you meet your match you will be mortal once more.
R.A.B."