A civil engineer assigned to build a railroad through the South American Andes causes friction when he refuses to work on a proposed tunnel through the mountains. He eventually gets his own way, and it looks as if he and his arrogant employer will settle their differences - until the engineer falls for his boss's daughter. Romantic drama, starring John Wayne, Cedric Hardwicke, Laraine Day and Anthony Quinn.

Engineer Johnny Munroe is enlisted to build a railroad tunnel through a mountain to reach mines. His task is complicated, and his ethics are compromised, when he falls in love with his boss's daughter