Y/N arrived at Hogwarts in sixth year as the quiet Slytherin transfer no one could figure out—until the Marauders turned her into the target of a cruel public prank. And Remus Lupin laughed. She vanished before the year ended, leaving behind humiliation, rumors, and a version of herself no one would ever see again. When she returns for seventh year, she’s completely different: beautiful, cold, brilliant, and impossible to ignore. Now Slytherin Quidditch Captain and top of her class, Y/N makes the Marauders’ lives miserable—especially Remus’s. But beneath the revenge and rivalry, Y/N is hiding dangerous secrets: a Time-Turner that’s slowly destroying her, a hidden resistance group with Lily Evans and Regulus Black, and the truth that she has known Remus’s werewolf secret for years. What Remus doesn’t know is that during every full moon, a silver wolf has always been there beside him in the Forbidden Forest. Protecting him. Because the girl he humiliated has secretly been the one saving him all along.