A disfigured Holocaust survivor sets out to determine if the man she loved betrayed her trust.

A middle-aged professor's young bride and his assistant plan to commit a double murder disguised as a "Crime Passionel", but discover too late that one of their intended victims has become a fellow conspirator.

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 Paris, a Polish gigolo marries a rich Jewish doctor and stands to inherit her estate when she is deported to Dachau by the Nazis.