[2] It is the first of seven films, loosely based on the 1960 Kommissar X #73 detective novel from the Pabel Moewig publishing house.

A man using the name Oberon informs the investigator that he is the next target in a series of murders, but he has his own hidden agenda.

American private investigator Joe Walker is on vacation in Europe when he is approached by a mysterious woman who is looking for a nuclear scientist named Bob Carroll.

Meanwhile NYPD Captain Tom Rowland is assisting the local police investigating the deaths of two businessmen in separate bombings.

Oberon orders that Joan be drugged to become like the other women of his army, but she escapes rescues Walker.

As Rowland makes his way to the island, Walker seduces Oberon's doctor and they free the female guards.