On the run from international police, Special Agent Lemmy Caution arrives in the South of France and soon becomes embroiled in a scheme with the infamous gangster Siegella. Whilst seeming to co-operate with the underworld boss, Lemmy is secretly acting for the FBI, and intends using Miranda Van Zelden, a wealthy heiress, as bait to trap a gang of crooks and put an end to Siegella's exploits...

A painter has his daughter brought up by a couple of innkeepers who run an establishment on the edge of the water with the sign: Here we fish. Having grown up, she refuses to join him and prefers her adoptive parents.