Clint Adams the Gunsmith 15: Andersonville Vengeance

OVER FIVE MILLION GUNSMITH BOOKS IN PRINT!
Commandant Henry Wirz put Clint through hell as a prisoner of war, and when the Union won, Wirz paid for his crimes with a public hanging. Or did he? Word is, the low-down scum is living in Frisco as a U.S. Senator. Now a fellow Andersonville inmate intends to get the job done right this time.
There’s no way Senator Winston is actually Wirz. But because Clint didn’t actually see him hang, he needs to discover the truth—a truth that will have the Gunsmith risking his life for an innocent man, or seeing justice done once and for all.