Two third-rate actors, longing to be famous, try to make the headlines by feigning a murder.

In the summer of 1890, Curé Labelle pushed for colonization. To flee Séraphin and the woman he loved, Donalda, Alexis got married and settled on a piece of land. Everyone joins forces to take their revenge on the hateful Séraphin.

Two second-rate, hammy actors, Hector Trignol and Achille Baluchet, come up with a fake murder story to draw attention to themselves. Baluchet is to kill Trignol, who will temporarily disappear then reappear, as if by magic, during the trial. But things don't go according to plan.

Filmed in French, this Canadian film was based on a popular Quebec-based radio serial. The man of the title is miserable miser Seraphim (Hector Charland). Misanthropic to the point of insanity, Seraphim takes great pleasure in destroying the lives of everyone with whom he comes in contact. His current target is Alexis (Guy Provost), the ex-lover of Seraphim's long-suffering wife Donalda (Nicole Germain). Taking into consideration its daytime-drama source, it's understandable that Un Homme et Son Peche is plotted and paced like a soap opera. Star Hector Charland had previously spent 10 years portraying Seraphim on radio, so he's got plenty of "mean" at his disposal for this big-screen spin-off.

A convict on the run returns to his native village to see his daughter again, who believes him to be dead. The priest intervenes to avoid a scandal that would reflect on the young girl on the eve of getting married.