Architect Dumas dies from a bullet of his own gun in front of his house. The police suspect his young Swedish wife Catherine and her English lover Tom Hastings. After numerous interrogations, in which they entangle themselves in contradictions, they try to flee, but are soon both caught and brought to trial, he in England, she in France. Only when Catherine keeps on proclaiming her innocence, superintendent Corbier finally considers believing her.
A neurosurgeon with a cheating wife takes an amnesiac into his home and conditions him to believe that the cheating wife is his own and to take the "appropriate" action.
Betrayed by an informant, Philippe Gerbier finds himself trapped in a torturous Nazi prison camp. Though Gerbier escapes to rejoin the Resistance in occupied Marseilles, France, and exacts his revenge on the informant, he must continue a quiet, seemingly endless battle against the Nazis in an atmosphere of tension, paranoia and distrust.
Middle-aged businesswoman Paula Tessier rejects the advances of her client's amusing 25-year-old son, Philip Van der Besh, but reconsiders when her longtime philandering partner begins yet another casual affair with a younger woman. She soon learns that May-December romances with older women are frowned upon in society.