Counterfeit lawman : a Ralph Compton western

"Augustus Yarrow is a top lawman, noted for going undercover to ferret out criminals: everyone from bank robbers to corrupt officials. He's the best of the best ... until he winds up dead. Isaac Scott is looking for something better than his life of riding the rails when the man he's sharing a car with is shot. There's money and mysterious papers on the man, who attempts to tell Ike something with his dying breat, right before Ike himself is arre...