The novel is a psychological thriller about a woman suffering from anterograde amnesia.[6] She wakes up every day with no knowledge of who she is and the novel follows her as she tries to reconstruct her memories from a journal she has been keeping. She learns that she has been seeing a doctor who is helping her to recover her memory, that her name is Christine Lucas, that she is 47 years old and married and has a son. As her journal grows it casts doubts on the truth behind this knowledge as she determines to discover who she really is.