Train wrecks, fires, and explosions sabotage the Southern Pacific Railroad's new express line. The railroad hires the Van Dorn Detective Agency, who send their best man, Isaac Bell. He discovers that a saboteur calling himself the Wrecker is attacking the Southern Pacific with accomplices recruited ...

Train wrecks, fires, and explosions sabotage the Southern Pacific Railroad's new express line. The railroad hires the Van Dorn Detective Agency, who send their best man, Isaac Bell. He discovers that a saboteur calling himself the Wrecker is attacking the Southern Pacific with accomplices recruited from down-and-outs - who are killed afterward.