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This brawny Universal picture was the perfect vehicle for its manly action star, Frank Mayo. Mayo is Bruce Henderson, who manages the fireworks plant for Danby & Son. Henderson is in love with the boss' daughter, Lucille (Helen Ferguson), as is sales manager Richard Mower (Charles Clary). Because he resorts to his fists during a fit of temper, Henderson is fired from his job. Lucille, who has sided with him, marries him. Danby (Melbourne McDowell) gives Mower Henderson's job, not realizing that Mower has been stealing from him. Mower attempts to call on Lucille, sending Henderson into such a fit of anger that she winds up leaving him. To save his father-in-law's business -- and his marriage -- Henderson disguises himself as a bum and gets work at the plant as a laborer. Danby and Lucille catch Mower and an associate robbing the vault. To make their getaway, the villains lock father and daughter inside. But Mower hasn't counted on Henderson, who tries to stop him. Mower takes a shot at him, but the bullet hits some explosives, and the plant erupts in flames. Henderson braves the inferno to rescue Danby and Lucille.