Just prior to America's declaration of war, Margaret Kenwood of the Kenwood Manufacturing Company determines that the plant should produce munitions to support the Allies. Rodney Sheridan, her sweetheart and a vice president of the company, remains unimpressed with Margaret's patriotism until he begins to suspect that the plant's president is involved with a group of German spies. Posing as a laborer, Rodney discovers that the president has agreed to blow up the factory in exchange for a large payoff from the German government. Rodney's claim of loyalty to the German cause earns him the assignment of planting the bomb, but a detective observes him acting suspiciously and arrests him. Although the evidence is against Rodney, he finally proves that the president and his cohorts are the real conspirators.