Conrad Lang is the handyman of a wealthy family. He grew up as the brother of Thomas, the family son who is the same age. Conrad accidentally sets fire to the large holiday home of which he was the guardian. He then returns to the city of his childhood, on the wedding day of Phillipe (son of Thomas) and Simone. Memory problems and repeated behavior quickly reveal neurological disease to Conrad, which brings Elvira, Thomas' stepmother, to install him with a nurse in the home of a friend.