The scene is French Guiana, a region where on Christmas day the temperature has graciously dropped to 104 degrees. Three convicts are employed as roofers by a family, whose roof is in desperate need of maintenance. On the way from France is an evil-minded cousin, to oust the father of the family from his business, and his cold-blooded nephew, who is jilting the father's daughter for an heiress. The three convicts—two of them murderers, the third a swindler—take the visitors on. All three have warm hearts and are passionate believers in true justice.