Roadblock is a 1951 American film noir starring Charles McGraw and Joan Dixon. The 73-minute crime thriller was shot on location in Los Angeles. The film was directed by Harold Daniels and the cinematography is by Nicholas Musuraca. Plot Insurance investigator Joe Peters (McGraw) and his partner Harry Miller (Louis Jean Heydt) solve a lucrative recovery case and prepare to fly home. Joe meets and gets played by Diane (Dixon) at the airport. Lacking enough money to fly on her own she pretends to be his wife without his knowledge in order to get half fare on her ticket. They wind up assigned to the same hotel room after a storm forces an unscheduled stop. An uneasy detente develops. Joe is attracted to the comely but diffident Diane, despite his dislike for "chiselers". She makes it quite clear she loves the finer things in life, which "Honest Joe" (as Diane calls him) cannot possibly afford on his small salary of $350 per month. They part uneasily when they reach Los Angeles. When Joe and Harry are assigned to check out the prime suspect in a string of fur robberies, Kendall Webb (Lowell Gilmore). Joe runs into Diane, who has become Webb's mistress. Their mutual attraction flares up and Joe, in order to finance a dream life with Diane, decides to use inside information on a cash shipment of $1.25 million to set up a robbery for Webb in return for one-third of the take. Unaware of the deal and disillusioned at being a kept woman, Diane decides that her love for Joe is greater than her avarice. When she tells Joe she wants to get married he tries to back out with Webb. However, Webb convinces him that Diane might not feel the same after a few months living on his paltry pay. The railway mail car robbery is successful, but a railroad employee is injured and later dies. The robbery coincides with Joe and Diane's honeymoon, giving him an alibi. One of the robbers is identified and arrested. With the investigation encroaching, Joe confesses to Diane what he has done. Desperate, Joe arranges to meet Webb on a desolate stretch of highway by telling him he has a plan to get them out of their mess. Instead, he knocks Webb out and stages a car accident in which Webb is killed and his share of the money partially burned.