Captain Justin Mollenard works for a company that sells armaments to the Far East. After an eventful stay in Shanghai, where he and his cargo are the victim of a malicious attack, he returns to his hometown of Dunkirk. Mollenard receives a frosty welcome from his wife Mathilde, who resents the way in which he has neglected his family for so many years. Mollenard’s only wish is to get back to sea as soon as he can, but a sudden heart-attack leaves him paralysed and entirely in his wife’s power...

Mollenard, capitaine au long cours, trafiquant d'armes, revient à Dunkerque après avoir perdu son navire. Celui-ci a été saboté par Bonnerot, un autre trafiquant qui a voulu se venger. Aigri et malade, déchu physiquement et moralement, Mollenard subit la froide cruauté de sa femme sans pouvoir réagir...