Search - Laws of Nature (Prowlers, Book 2)

From the back of the book:
Jack Dwyer defeated the pack of Prowlers who had preyed upon the city of Boston with their leader, Owen Tanzer. Tanzer may be gone, but now that Jack is aware of their existence, he is on a constant lookout for evidence of Prowler presence elsewhere. So when his sister, Courtney, and her friend Bill uncover reports of vicious animal attacks on rural Buckton, Vermont, his suspicions are aroused. Messages from the Ghostlands confirm the worst,and Jack and Molly-whose feelings for each other are growing harder to ignore - head for the mountains.

Buckton is a small, quaint town. Jack and Molly are expecting a warm welcome, but instead they are met with distrust. Soon they deiscover that Buckton is a town with deep secrets, and before they know it, the two become the lead suspects in arash of brutal murders...