You pull the invisibility cloak over your head, and the world blurs into silver shadow around your hands. The handle turns with a chill that bites through your fingers, and the door eases open on a breath of stale air. Inside, pale light spills over shelves, charts, and a stone floor marked with strange chalk lines. Your scar flares once, warning you that whatever is here is already aware of you.

The room is empty at first glance, but the whispering continues from somewhere near the back wall. You edge forward beneath the cloak, careful not to disturb the dust, and spot a narrow trapdoor half hidden by a curtain of old cloth. A faint glow leaks through its seams, soft and pulsing like a heartbeat. Hogwarts feels suddenly narrower, as if the castle itself is guiding you toward the secret below.