The Bogart suspense picture with the surprise finish -

Dixon 'Dix' Steele, a down-on-his-luck screenwriter needs to adapt a trashy novel. At a night club, the hat-check girl, Mildred Atkinson is engrossed reading it. Too tired to read the novel, he asks Mildred to go home with him, to explain the plot. Later that night, Mildred is murdered and Steele is a prime suspect, his record of violence when angry goes against him.