Accountant Augustus King (Lyle Talbot) discovers that his wife, Marge (Jean Willes), is having an affair with his boss Sam Bellows (Onslow Stevens). He telephones Internal Revenue Bureau that he can give evidence of a large tax-evasion racket. Before IRS-agent Steve Daniels (Douglas Kennedy) arrives, King is murdered by a henchman of Bellows and his partner, Ernie Medford (Archie Twitchell.) Daniels discovers that Bellows and Medford are smuggling gold bullion from their mine in Mexico, and sell and bank the money under assumed names. they hide the bullion in a compartment welded to the bottom of a car.