What is the main conflict in Cycle of the Werewolf by Stephen King?

Cycle of the Werewolf is one of Stephen King's shorter horror novels and the book is beautifully illustrated by noted comic book artist Berni Wrightson. The straightforward plot follows a year in the life of a small town in Maine as, on the night of each month's full moon, its residents are terrorized by a werewolf who turns out to be one of their own.