Bushwackers At The Circle K by Chet Cunningham
Riding toward the Circle K, Dave Kemp had time to think about the telegram he had received, only days ago, from his sister, Janie. It had been hard for Dave to leave St. Louis and the study of law, but Janie would need him now. Their father was dead. But when Dave arrives at the ranch, he finds Janie and the ranch hand murdered. In town, Kemp learns from the sheriff that his father had not died a natural death - and vows revenge.