Return of the Night Creatures by Charles Ray & Jerry Underhill
The Sheriff of Twin Forks has been changed into a werewolf. Following the failed hunt for the werewolf that had been murdering residents, he wakes up in the badlands healed and angry. Back in town, the Marshals’ Service has sent two of their best to investigate the killings. Hoby and Enrico will have to face each other, the investigation, and those in town who believe they were responsible for the murders, and who intend to do something about it.