When Sam rescues an abused mare from outlaw horse rustlers, she knows she's done the right thing. But the ranch already has a full corral, and a long drought means the cattle are running out of grass. Of course her dad refuses to allow her to adopt another mustang.

The frightened and dangerous mare is just beginning to trust Sam when the rustlers learn Sam is the one who told the authorities about their illegal wild horse trap. Now, it's up to Sam to keep the mare - and herself - safe.