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

John Wayne
as Johnny Munroe

Laraine Day
as Maura Alexander Munroe

Cedric Hardwicke
as Frederick Alexander (as Sir Cedric Hardwicke)v

Judith Anderson
as Miss Ellen Braithwaite

Anthony Quinn
as Ricky Vegas

James Gleason
as Pop Mathews

Grant Withers
as Fog

Paul Fix
as Joe

Fernando Alvarado
as Chico

Harry Woods
as Holden
CinemaSerf
"Johnny" (John Wayne) and his long-suffering partner "Pop" (James Gleason) do contract mining work and are building a tunnel for railway owner "Alexander" (Sir Cedric Hardwicke). This latter man is a bit of a pile driver and they are already arguing about safety and cost cutting at the tunnel when "...