Cycle of the Werewolf by Stephen King (1983) — see its film and TV adaptations.
A werewolf is stalking Tarker's Mills and only young, wheelchair-bound Marty Coslaw suspects the truth. He enlists the help of his black sheep uncle to identify the shape shifter and destroy him. ([source][1]) [1]: https://stephenking.com/library/novel/cycle_of_the_werewolf.html
