This Gun for Hire is a 1942 film noir, directed by Frank Tuttle and based on the novel A Gun for Sale by Graham Greene. The film stars Veronica Lake, Robert Preston, Laird Cregar, and Alan Ladd. In wartime San Francisco, chemist and blackmailer Albert Baker (Frank Ferguson) is killed by remorseless hit man Raven (Alan Ladd), who recovers a stolen chemical formula. Raven is double-crossed by his employer, Willard Gates (Laird Cregar), who pays him with marked bills and reports them to the Los Angeles Police as stolen from his company, Nitro Chemical. Raven learns of the set up and decides to get revenge. LAPD detective lieutenant Michael Crane (Robert Preston), vacationing in San Francisco to visit his girlfriend and nightclub entertainer Ellen Graham (Veronica Lake), is immediately assigned the case but Raven eludes an attempt at capture.