Casablanca 1942. In the service of the allied counter-espionage, the agent Max Vatan meets the French resistant Marianne Beauséjour during a high risk mission. This is the beginning of a passionate relationship. They married and began a new life in London. A few months later, Max is informed by the British secret services that Marianne could be a German spy. He has 72 hours to discover the truth about the one he loves.