The narrative begins when Conrad Veidt's ship is regularly inspected by the Royal Navy for prohibited goods, resulting in a 24-hour detainment. He secures two shore leave permits for himself and his first mate, but these are lost, leading him into an inquiry where he meets Valerie Hobson, who plays the enigmatic "Mrs. Sorensen." This quickly draws him into a clandestine Nazi spy operation. Similar to “The Spy in Blac…