Murder on the Home Front

In 1940, in London, a prostitute is found dead in her room in a boarding house with a swastika carved on her tongue. The rookie pathologist Dr Lennox Collins is summoned by Detective Freddie Wilkins to investigate the crime scene. They meet the snoopy journalist and aspiring writer Molly Cooper in the spot and Lennox invites her to be his assistant. Then they interview the Anglo-German Wilfred Zeigler, who found the body and collect cards of women photos. After the autopsy, they discover that the woman had gone to the Metropol night-club and they decide to visit the place with Wilkins. Three men do not have alibi and become suspects. When two other women are murdered in the same modus operandi, Wilkins accuses Zeigler with circumstantial evidences only. When the gay actor Ronald Terry is found dead apparently after committing suicide, Lennox and Molly believe the murders are connected. Lennox is not convinced that Zeigler is the serial-killer and proceeds with his investigation. Who might have killed the women and the actor?