Rosalie Granger arrives at Hogwarts with one goal: uncover what Draco Malfoy is hiding before the war reaches the castle walls. Using an advanced Polyjuice disguise, she infiltrates Slytherin under the identity of pureblood heiress Evelyn Rosier, expecting to disappear unnoticed among future Death Eaters. Instead, Draco notices everything. The wrong gestures, the hesitation in her stories, the way she watches him like she’s searching for cracks. What begins as suspicion turns into a dangerous obsession as late-night patrols, secret conversations, and shared lies pull them closer together. But the longer Rosalie pretends to be someone else, the more she begins to lose herself in the role — and when Draco finally discovers the truth, he makes a choice that could destroy them both: he keeps her secret.