It's early morning in Sainte Victoire and Gloria lets her dog Douglas out, unwittingly leading him to the discovery of a lifeless body with a fencing foil protruding from his chest, and in possession of an extremely rare diamond encrusted cufflink.

Caron, sensing a peculiar case, asks Jean to examine the ominous foil— which seems to be a 19th-century Epee du Combat. Eager for clues, Jean insists on scrutinising the confiscated swords back at the police station.

Dom arrives at La Couronne to find it closed. He's dragged inside by a concerned Judith and Jeremy who explain that the previous pub owners ran into financial troubles and they have secretly owned it for a few years now.

Back at the police station, Caron reveals that the stolen epee swords were part of a theft from a local museum. The victim, George Allaire, once a big-time local gangster, had taken a turn into petty theft. The mystery deepens as they ponder his demise and the inexplicable possession of the expensive cufflink?

Jean shows Charlie and Simone a photo of the cufflink, prompting Simone to admit to crafting a copy for a mysterious and potentially dangerous client.

We soon discover that it is not just any murder but a story of honour and the last-ever duel to take place in Sainte Victoire.