To his family, François Voisin is nothing more than a humdrum civil servant. In truth, for the past twenty years he has been working as a secret agent. All goes well until circumstances put his secret in danger.
After a tumultuous life, a middle-aged headwaiter in a Parisian restaurant dreams of opening a seaside amusement park. When an old flame reappears, he reignites his feelings, but she is involved with another man.
After a successful bank robbery, Micky hopes to take back his girlfriend Marie who has been taken from him. On the way to Paris he meets Leon, a neurotic dreamer whom he considers an idiot. Leon can hardly understand what Micky is up to but he follows him everywhere and soon falls in love with Marie.
