Pit Brown and his assistant Tomy are detectives and diving experts. The two squids ”are always there when their special expertise is required to solve a crime. In cooperation with the police authorities, Pit and Tomy track down kidnappers, for example, whose base is a yacht lying outside the French three-mile zone, or they solve a bank robbery committed by frogmen in Hamburg. But also drug smuggling and strange accidents on the beaches of the Côte d'Azur call the squids on the scene.