Johnny Mack goes to work on "Ma" Curtis' ranch, to the disapproval of his friends, rancher Glenn Hadley and his sister Beth, who are at odds with her. Secretly, Ma's foreman Stoner is plotting with real estate man Ed Dutton to ruin her ranch and acquire it cheaply, with controlling water rights. Johnny stops henchman Dade in an attempt to dynamite the barn and Stoner, supposedly taking him to the sheriff, kills him. Johnny stops Glenn and Beth from tearing down a Curtis fence in order to get their cattle to water, but Glenn refuses to help even after Johnny explains he is helping Ma in order to find out who is behind the attacks on both ranches. Ma pretends to fire Johnny for saving Glenn from an ambush. As the outlaws attempt to rustle Ma's remaining cattle, Johnny, Alibi and Glenn join forces.
Johnny Mack Brown
as Johnny Mack Brown
Max Terhune
as Alibi
Tris Coffin
as Ed Dutton
Riley Hill
as Glenn Hadley
Sarah Padden
as Ma Curtis
Eddie Parker
as Henchman Lacey
Fred Kohler Jr.
as Henchman Stoner
Felice Ingersoll
as Beth Hadley
Kenne Duncan
as Henchman Kirk
Myron Healey
as Murdered Henchman
Bill Hale
as Henchman Bud
Bill Potter
as Singing cowhand Bill (as Bill Porter)
