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.
| Actor | Role |
|---|---|
 Annie GirardotSuzanne Corbier | Suzanne Corbier |
 Bibi AnderssonCatherine Dumais | Catherine Dumais |
 Michel GalabruLe procureur | Le procureur |
 Michel AuclairPhilippe Dumais | Philippe Dumais |
 Georges GéretLe commissaire Lachot | Le commissaire Lachot |
 Dominique PaturelMaître Rhune | Maître Rhune |
 John SteinerTom Hastings | Tom Hastings |
| SSylvie FavreMme Ventoux | Mme Ventoux |
| DDavid LangtonSir Geoffrey | Sir Geoffrey |
 Jacques MorelLe président | Le président |
 Ronald AdamLe juge anglais | Le juge anglais |
 Vernon DobtcheffPeter | Peter |
 Florence GiorgettiGisèle Polmi | Gisèle Polmi |
 Michael GoughSir Baldwin | Sir Baldwin |
| CColin MannRamsay | Ramsay |
 Alain MottetL'avocat général | L'avocat général |
 Albert AugierLe garagiste | Le garagiste |
 Angelo BardiAngelo | Angelo |