Hunting down killers to help bereaved families get justice is more than just a job; it’s a duty for Thomas Bareski, a retired, hotshot police detective eager to reopen unsolved murder cases in a mission to find the culprits.

This is the story of four French friends: the Greek (an osteopath), Fifi (who lives with his mother), Fortuné (a West Indian) and Freddy (a gambler). They meet up regularly at a Parisian bookmakers’, their favourite haunt. Tired of frittering away the little spare cash they have, they agree to give up gambling. But no sooner have they taken this pledge than Fate intervenes, in the guise of the turf king, Monsieur Paul. The latter persuades the four friends to buy a champion racehorse, not knowing that it is in fact an old nag…