Coming out from jail, Lucas has decided to change his life and behave like a good citizen. But when he is taken hostage in a bank by a hare-brained robber, no cops can believe he is not part of the action.

Jean-Paul Belmondo plays Paul, a former womanizer who marries the head of the medical department's "unattractive" daughter Christine because he thinks attractive women can't be trusted and make poor wives. A car accident leaves him bedridden and he begins to miss his playboy days, when Christine's bombshell sister Martine arrives and Paul decides he must have her. He begins drugging Christine at night so he can sneak out to kill of Martine's many suitors one by one.

In the 1930s, in a village in Gironde, Guillou, a young boy in need of affection, nicknamed the Sagouin, unhappy and in need of affection, leads a life of anguish and sadness in a sinister castle. He exasperates his mother who sees in him only the hated reflection of a husband she only married to become a baroness. Thanks to the kindness of the village teacher, Guillou glimpses for a moment the existence of another world, of gentleness and tenderness.