Every morning Christine Lucas wakes up in an unfamiliar room, next to an unfamiliar man. She looks at herself in the mirror and doesn’t recognize her body, because it looks twenty years older. Every morning, this man explains to Christine that he is her husband Ben, and she suffers from a form of amnesia in which all old memories are lost and new ones are not retained. On the advice of the doctor, Christine, secretly from her husband, begins to keep a diary and writes down everything that she manages to learn and remember during the day, trying to recreate her past and the fatal incident that deprived her of memory. One morning she opens her diary and sees that she has written three unexpected and terrible words: “Don’t trust Ben.” Suddenly everything her husband said seems suspicious to Christine. What accident caused her condition? Who can she trust? Why is Ben lying to her?