Six months before his retirement from the criminal police, inspector Joss finds his colleague Gouvion dead, in a poorly faked suicide attempt. Joss loses his temper, and investigates on his own, which leads him through the bas-fond of Paris...
Comissaire Joss, le Pacha
Nathalie Villars, la sœur de Léon
Marcel Lurat, dit Quinquin
l'inspecteur Albert Gouvion, amant de Nathalie
Marc, un inspecteur