The year is 1942. Clara Vine is working undercover in Germany as an agent of British intelligence. During a hiatus in the filming of Goebbels’ latest propaganda film, the Sinking of the Titanic, she is covertly approached and asked to track down an errant British spy called Victor Stern. Stern is a physicist, feared to be passing vital secrets to the enemy. He also happens to be Clara’s former lover, who she met in Vienna at the home of the actress, Hedy Lamarr."