The Border Legion is the adventure of a daring frontierswoman and the men she inspires. Joan Randle is a strong, capable woman living with her uncle in the wilds of Idaho. She likes Jim Cleve but is impatient with his laziness. After a quarrel, Jim heads to the lawless Montana border to prove himself, and a remorseful Joan tries to track him and bring him back. She finds herself in trouble when Jim Kells, the outlaw and scourge of the border, comes across her camp. What follows is an unexpected tale of crime, dissolution, bravery, and redemption.