125 rue Montmartre

In Paris, the newspaper seller Pascal is a simple, but honest man respected by his friends. He has a love affair with Germaine "Memene" Montillie, who works distributing newspaper to the sellers. One day, Pascal is resting nearby the Sena, he sees a man jumping into the water of the rives trying to commit suicide. Pascal saves him and the man, Didier Barrachet, tells him that he is in unrequited love with his wife, Catherine Barrachet, but his brother-in-law Phillipe Barrachet and she want to intern him in a mental institution to steal his wealth. Pascal brings Didier home and help him to prove that he is telling the truth. He also visits Catherine that confirms Didier's story. Out of the blue, Didier is murdered at home and Pascal is accused of killing him. But when Pascal looks at the body, the man is not Didier. But the smart inspector Dodelot wants more evidences to blame Pascal.