The chief of the Keystone police incurs the enmity of a gang of Italians at about the same time that he fires a member of the force. The Italians, coming upon the discharged officer, command him to place the bomb which they have procured for blowing up the chief's house. The officer, though sore at his boss, is not in favor of murdering him. But a few pistols pointed at all the vulnerable spots in his body, and the bomb thrust into his hands, tell him what he must do. He enters the chief's house, then, hearing the family come in, leaps into a box couch, bomb and all. The chief's wife sits down on the couch, and her weight causes spontaneous combustion of the bomb. Naturally, this gives the policeman a chance to make his escape. A chase ensues, and the unwilling bomb bearer takes refuge in a storehouse belonging to the Italians. Meanwhile, he has lost his bomb, it having changed hands too rapidly during his flight for him to keep track of it. In the storehouse he finds the chief's baby, and in restoring it to its distracted parents, receives the chief's forgiveness for all past offenses, just as the house full of Italians explodes.
—Moving Picture World synopsis