ather Brown welcomes visiting German priest Father Frank but returning from the station they encounter an injured man,stripped to his underwear who has been thrown from a train. Suspicion falls on prostitute Annie Mace,who was travelling on the train though she is given an alibi by scrap dealer Christie Nolan. Then Lady Felicia's chauffeur Sid comes into the frame when it turns out that he stole the victim's wallet. In solving the crime and determining who is telling the truth the father also has to combat anti-German prejudice among his flock.

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