Countess Margherita is a Sicilian girl who is about to be married, but Caesar Maruffi, the head of a criminal syndicate, wants her for himself. He arranges to have the bridegroom assassinated, and Norvin Blake, a young American (Robert Elliott), almost loses his life in his attempt to save him.
Alaskan railroad magnate Curtis Gordon hires engineer Dan Appleton to design a railroad route up the Salmon River to the rich gold country. Gordon turns down the engineer's proposed route in favor of his own, and Appleton quits. Murray O'Neil, a rival builder, hires him and falls in love with his sister Eliza, while Appleton courts Natalie, Gordon's stepdaughter. Following Appleton's plan, O'Neil lays the trail with a bridge crossing the river in face of Gordon's opposition.
