Everyone knows Theodore Nott is cold, unreadable, and impossible to get close to—except when it comes to Y/N, the one person who grounds him and brings out a rare softness he keeps carefully hidden. When a former Hogwarts student attempts Legilimency on Theo and, for the first time, finds a mind completely closed off to him, that failure sparks an obsession he cannot let go of. Unable to understand or penetrate what he cannot read, he returns to Hogwarts under the guise of research, determined to solve the one mind that refuses him. As strange disturbances begin to follow Theo and Y/N at school, it becomes clear that being unreadable has consequences neither of them could have anticipated.