Claude Gaspard was incarcerated in the prison of Health, following a false testimony of his wife accusing him of trying to assassinate him. Its cellmates four inmates who prepare their escape. Claude is adopted. With a fierce energy, they dig a tunnel to lead them to freedom. The day chosen to put their plan into execution, Claude is summoned to the prison director. He informs that his wife had withdrawn her complaint, he is free. Skillfully questioned, betrayed his friends Claude and reveals the plan of escape.