A boy called "Mascot," presumably the son of smuggler Captain Stark, is raised by Mr. Deane, the British military governor of Kingston after the boy's ship is captured. Years later in London, Mascot, now known as Stanley Deane, is the lawyer for the radical organization of mill employees called "The Well." Stanley falls in love with mill owner Amos Buckingham's daughter Alice, whom he knew when they were children. But Buckingham hates Stanley for his aid to the workmen and turns Alice against him by telling of his mysterious parentage. The workmen plan to blow up the Buckingham mansion and kill its master who, unknown to anyone, has disguised himself and gained admittance to The Well to study the real condition of the men. Stanley saves Alice, but after the explosion, a charred body supposed to be that of Buckingham is found and Stanley and all in The Well are arrested for murder.