Conrad Lang, a handyman in a rich family - he has been raised like a brother with Thomas, who has the same age -, accidentally puts fire to the big holiday house he keeps. He returns to the town he grew up in, to the family home, where Philippe, Thomas's son, and Simone are getting married. Conrad's frequent memory loss and behavioural problems rapidly reveal a neurological disease (Alzheimer's is suggested by doctor Cohen when he examens Elvira) which leads Elvira, Thomas's stepmother, to install Conrad in a guesthouse on the property, with the help of a nurse. When Conrad looses more and more his landmarks in present and past, memories of his youth come back to surface. They intrigue Simone, since these memories do not entirely fit together with the official family history...