Monsieur La Souris is a well-mannered tramp who opens car doors in front a nightclub. One evening, a car pulls up and a corpse spills out. Monsieur la Souris recuperates the wallet. The victim turns out to be a rich banker who was also a stamp collector, a fact which leads the tramp to finding the murderer.—Happy_Evil_Dude
On a rainy night, eccentric tramp Mr La Souris finds a corpse. But the body soon vanishes in his car leaving only his wallet. While the police start investigating a missing person report, La Souris concocts a plan to secure his find.