Boyd sets out to learn whether Jory is a cattle rustler and goes to work on his ranch. He is framed for murder when he's discovered by Jory's men. Young Larson is the one who proves Boyd is innocent and enables him to complete his task. Boyd discovers that Jory is working with mine owner
Givot and that they have turned the mine into a giant cattle pen. Robert Mitchum contributes his third bit part to the "Hopalong Cassidy" series.