When another dead elderly gentleman is fished out of the Thames, Inspector David Perkins is convinced that the gorilla gang is active again. On a doll found with the body, characters of an African language are discovered. Together with Sergeant Pepper and language specialist Susan MacPherson, the search for the head of the gang begins.

Inge Thal works as a tax expert in Munich. One day, the pretty, young woman inherits a run-down farm in Tyrol and decides to move there.

Monique finances her medical studies as a go-go dancer in a Munich nightclub. Her relatives, who are involved in local politics, want the club, which they consider immoral, closed down, but during an inspection tour they take a liking to the establishment themselves, taking indecent photos on behalf of the club owner. This leads to an intriguing story full of lies and blackmail, from which everyone involved tries to get out without losing face.

Walter Bergman is a boring old travel agent. One day while away on a business trip, he starts hanging out with a group of young swingers.

Scotland Yard is after a homicidal maniac called The Blue Hand, which is what he uses to kill his victims.