Hastings and his partner, Warren, on the perfection of their wireless telephone, go to John Manners, father of Hastings' sweetheart, for funds to finance the invention. Manners refuses aid and sends Sykes to break into the test station and make sketches of the machinery, meaning to steal the patent himself. Hastings, however, discovers Sykes at his work. After a fierce hand-to-hand combat the latter escapes with Manners in an automobile. Hastings contrives to get in touch with his partner by means of the new invention. He is stranded several miles away with a wireless telephone apparatus, on a road over which Manners and Sykes must pass. Warren succeeds in causing the arrest of the fugitives, and Manners, on his release, vows vengeance. He breaks into the test station and arranges a steel plate in such a way that whoever touches it will be electrocuted. Instead of Hastings, however, it is Mary, his daughter, who is first exposed to the danger. In his effort to turn off the current before it is too late, Manners, not knowing the right switch, tries them all. His own body deflects the current, bringing instant death.
—Moving Picture World synopsis