During a visit to Venice, Professor David Ullman--one of the world's leading authorities on demonic literature--witnesses a terror in a tiny attic room. Then his 12-year-old daughter Tess disappears before his eyes, and he must find her while confronting an unspeakable darkness along the way.

During a visit to Venice, Professor David Ullman--one of the world's leading authorities on demonic literature--witnesses a terror in a tiny attic room. Then his 12-year-old daughter Tess disappears before his eyes, and he must find her while confronting an unspeakable darkness along the way.