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Lt. Pete Wright and his partner, members of the Los Angeles police gangster squad, set out for Las Vegas to arrest Mal Granger on a murder charge. While they drive, Wright reflects on Granger's downfall: Granger works for the telephone company and supplements his meager salary by betting on the horse races. Chippie Evans, his bookie, suggests that Granger could make even more money by using his electronic expertise to help Vince Walters, the owner of a racing wire that furnishes bookmakers with the results of every race direct from the track. Walters, who wants to expand his network throughout the state of California, offers Granger a good salary to set up and maintain an expanded system. Granger is also drawn to the arrangement by the presence of Trudy Maxwell, Walters' attractive assistant. Meanwhile, Wright is assigned to the newly established gangster squad and investigates Walters' organization, which is suspected of being a front for illegal gambling. One day, while signaling the changing odds of a race, which are then transmitted to Walters, Trudy is arrested and then banned from the track. Granger keeps refining the signaling process and eventually, is able to pressure Walters into making him a partner. When Walters is killed by a member of his gang, Granger takes over his position. After his success attracts the attention of an eastern syndicate, Larry Mason and his attractive wife Gail are sent to Los Angeles to make an offer to Granger. At first, Granger refuses to join the syndicate, but Carl Stephans, the head of the syndicate, successfully uses the flirtatious Gail as bait, and Granger later announces the partnership to his bookies. The syndicate demands protection money from the bookies, and those who refuse are terrorized. Disgusted, Trudy reveals that the syndicate is cheating Granger. Granger, who has fallen in love with Gail, then plots to run away with her. After Mason beats up Gail, Granger hires a man named Gizzi to kill him. Gizzi blackmails Granger, who then runs him off a pier. Then using a device that he invented, Granger calls Wright, pretending to be in Palm Springs, in order to establish an alibi. When Wright detects a street car whistle on the tape, however, the call is revealed to be a fake. With the help of Gail and Chippie, the unsuspecting Granger sets out to swindle the syndicate's Las Vegas bookies, but Chippie is recognized by one of them, who tips off Stephans that Granger is in Las Vegas. In the meantime, Wright identifies Granger's car as the one that killed Gizzi. When they learn that Chippie has been killed by the syndicate, Gail and Granger try to escape, but the police and the syndicate catch up with them at Boulder Dam. Granger is killed in the ensuing shootout, and Gail is arrested.