Harry Potter and the Deathly Hallows (Harry Potter, #7)

by J.K. Rowling

“Sign?” said Harry, looking over at Xenophilius too. The strange triangular eye was gleaming on his chest. “Why? What’s wrong with it?” “Grindelvald. That is Grindelvald’s sign.” “Grindelwald . . . the Dark wizard Dumbledore defeated?” “Exactly.”