A young couple has just got married. He is an advertising artist in an agency on the Champs-Elysees. She is a window dresser in a department store on Boulevard Haussmann.

Paula Nelson goes to Atlantic City to meet her lover, Richard Politzer, but finds him dead and decides to investigate his death. In her hotel room, she meets Typhus, whom she ends up knocking out. His corpse is later found in the apartment of David Goodis, a writer. Paula is arrested and interrogated. From then on, she encounters many gangsters.