His Brother's Debt by Louis L'Amour contains 2 stories:

HIS BROTHER'S DEBT told by Stan Winiarski. Rock Cassidy is a tall, strongly built man. Men had often said they would hate to face him in a shootout! But he has a secret-Rock Cassidy is yellow! Will he let his secret keep him on the run for life or will he face his accuse and overcome his past?

TRAIL TO PIE TOWN told by John Malloy. Young Ruth Grant and her little brother Billy traveled from St. Louis to claim their family land. Her father had trusted the family savings to a stranger, Dick Lowe, to buy and stock a ranch out West. Lowe bought the ranch, all right......but for himself!! Enter Dusty Barron and get ready for an exciting Western showdown.