Through the eyes of five different characters, the story unravels. Mathilde Oliver, the OCD daughter of a Cambridge don, is attempting to trace the writer of a series of letters. Letters that are addressed to Katja, a student at Corpus Christi who doesn't seem to exist. The nameless body and the obscure letters lead Frohmann and Keene to Deeping House, where they begin to unravel a web of passions and secrets, of long-buried crimes and fresh horrors.