Arsène Baudu and Hyacinthe, a pair of small-time crooks, fall prey to Alexandre Larsan-Bellac, who involves them (against their will) in high-profile swindling, but their success is quite limited. For starters they are deceived by Mrs. Paterson, a charming widow. Later on, Ribeiro, a Portuguese contractor and former victim of the two crooks, traces them and forces them to work on one of his building sites for damages. Just then, Larsan-Bellac resurfaces with plans to lure Ribeiro once again. —Guy Bellinger

Deux petites crapules minables, Yacinthe et Arsène, tentent sans succès de rouler Alexandre Larsan-Bellac, un escroc de haute volée. Celui-ci va les utiliser pour monter un gros coup qui réussira, mais pas dans le sens que les trois protagonistes espéraient...