Simon, a retired police inspector, does not appreciate being placed in a retirement home. Fortunately, he quickly becomes friends with Alfred, another resident. When Alfred dies under strange circumstances, the management, supported by the gendarmerie, declare it an accident. Simon, meanwhile, is convinced that this is a crime and he is determined to solve the mystery. With another resident, Francky, rocker and kleptomaniac rogue, he goes for an unusual police investigation.