Barr Cross

Champion rodeo rider Richard Thurston is prevented from competing in a rodeo by the event's crooked chairman Riggs, who has bet a sizable amount of money on another rider and doesn't want to take a chance of losing it if Thurston competes and wins. As if that weren't enough, Riggs also frames Thurston for the theft of money from Daisy Hollister, the owner of the ranch where Thurston works. Complications ensue.

Ace Remsen and Deuce Remsen are twin brothers. Deuce is a bandit and he is slain by Ace. The good Ace goes undercover as Deuce in order to solve the murder of the rancher Seth Waverly. During his investigation Ace falls in love with Seth's attractive daughter Merrill.

An old prospector, is found murdered and Sonora Slim is accused of the crime. The real killer is actually Silver Sam McGee.

Two men claiming to be scientists arrive in Arizona looking for Blair, a fellow scientist who disappeared while developing a death ray. The men hire Jim Wilson, who finds Blair living with his daughter on a ranch in an inaccessible valley near the Grand Canyon, where the scientist is testing his ray on birds and wild animals.