Modeste is a timid watchman at an automobile factory which is run with an iron hand by its owner, Roger Drapeau. One evening, Modeste leaves his post to visit a fairground, where he meets the attractive Aline. Having glimpsed his employer, Modeste makes a hasty return to the factory. When Monsieur Drapeau appears, Modeste explains that it must have been his twin brother that his boss saw at the fairground, a nasty piece of work named Raphaël. Not only does Drapeau fail to see through this unconv...