Jim Cole, heir to a mining operation, takes over the mine, which is suffering from unexplained low production, and is facing a strike by the miners. Jim will soon loose the mine if production doesn't increase and the sabotage continues. Mary Norsen, office-secretary, accidentally learns of a plot by Fred Johnson to wreck the mine and force Cole to sell his coal-mine. She and her brother, Joe, join Cole in his fight to stop Johnson.

Two men are vying for the favours of Gaby. One of them takes her for a motorcycle ride, the other in his car. When the second man manages to marry her, the first takes his revenge. He calls the police, and takes the newlyweds along on a kamikaze ride in his car, chased by the police.

Idaho, returning to the area he left as a boy, gets in the middle of a range feud. He takes the side of Endicott. On the other side is Hollister who is unaware that Idaho is his long lost son.

An old miner is ambushed by outlaws trying to steal the $10,000 he is carrying to start up a new mine. A passing cowboy comes to the miner's aid, but winds up getting blamed for the attack.

Two brothers are separated when young. One becomes the pony express rider Clint Knox and the other the outlaw Ace Carter.