A student from an elementary school accidentally breaks the glass roof of his school. His comrades decide to support it by working during the summer holidays in order to pay for reconstruction.
Boudu, um mendigo parisiense, tenta se suicidar no rio Sena, mas é resgatado pelo rico livreiro Sr. Lestingois. Este decide acolher Boudu, sem suspeitar que o mendigo deixará sua casa de pernas para o ar.