A radio detective sets out to solve an old murder case, with the help of her sound man and another radio detective. They manage to talk to the people involved in the case, but shortly afterwards the main suspects turn up dead.

A nightclub star helps trap an enemy agent on the trail of an American newsman.

Henry Stephenson stars as a retired Scotland Yard detective. He is regarded as an icon because he has written volumes of books on the art of detection. While Stephenson is being honoured for his past successes, he senses modern detectives, particularly the current District Attorney, look at him and his methods as outdated. This spurs the old man out of retirement to prove himself to the know-it-all modern detectives.

Various performers and backstage crew come under suspicion when a dancer is found murdered at a burlesque theatre.