“Alice and the Locked Room” waits quietly behind a web-covered frame, clutching a heavy iron key. No one remembers when she was first placed there, or what door the key belongs to. Some say she guards the threshold to a room that must never be opened; others whisper that she’s only waiting for someone brave—or foolish—enough to turn the lock. Her wide, glassy eyes seem to follow every movement, as though she already knows who will try.