How is it that two women can hate one another so viciously, yet loathe the man they share more, so much so that they're willing to plot his murder? Paul Meurisse answers that question easily, as Michel, the cruel headmaster of a French boys' school: he's a beast of a man, with a poisonous tongue and swift hand. His wife, Christina (Vera Clouzot), who actually owns the school and is stuffed with money, has suffered years of abuse, as has his mistress, Nicole (Simone Signoret). Together they plot a murder they believe to be almost perfect, right down to the details of their alibi, which, of course, involves the two women vouching for one another.
