Trouble Man by Ed Gorman

Ex gunfighter Ray Coyle heads to Coopersville to collect the body of his dead son, killed in a gunfight. Not wanting to rock the boat in the little town, the sheriff advises Ray to head back home on the next train. What ensues is the story of a bitter man, Harry Winston, recently released from prison also coming back to Coopersville to collect his share of robbery money and get revenge. The triangle is completed when spoiled, mean, vicious Bob Trevor finds his past catching up with him. Gorman writes a compelling and entertaining tale of life in the early west. A good read.