In Toulon, Jimmy's body is found hanging in his saloon-restaurant, dressed in full cowboy regalia; it is a murder disguised as suicide; Marianne's team investigate the death.

An experienced HGV driver is found dead, crushed by the wheels of his truck; an investigation that immerses Marianne and her team in the world of long-distance truck drivers.

At a pet fair, Lucie, a young home help and a volunteer worker at the local animal refuge, is found dead following an anaphylactic shock; everything points to murder; the investigation puts Marianne and her team on the trail of animal traffickers.

Jade, lead dancer in a cabaret, is found dead in a dumpster behind a club; the ambitious Naomi, her main rival, is the prime suspect; Marianne also takes a close interest in Prudence, previously employed as a nanny by the victim.

The remains of a train driver are found on a railway line; all the clues point to him being knocked unconscious then placed on the rails whilst waiting for a train to pass; Marianne investigates the case.

When the body of a captain is found in an underwater wreck, Marianne enters the world of deep-sea fishing.