A woman is found murdered in a closed amusement park. A young couple who happen to be there at the same time become, without their knowledge, suspects for the murder. They are chased by a large number of police but only Martin Beck believes them to be innocent.
Seventeen year old Rita grows up in an upper-class Swedish seaside society in 1965, and is very close to her father, Gerhard. Rita rejects the boys from the tennis club, and prefers to go out with Jimmi in his laundry delivery van.
When the old University Professor discovers that some of his pupils often sneak into a speakeasy, The Blue Angel, to visit a dancer, Lola, he comes there to confront them. But instead he is attracted to Lola. He returns the next night to The Blue Angel to spend time with Lola and stays overnight....
