From the back of the book:
A series of mysterious deaths leads Jack Dwyer and Molly Hatcher to the fastlanes, rest stops, and all-night diners of a highway in upstate New York. Meanwhile, their friend Bill Cantwell heads to Manhattan in search of his missing niece, a fledgling musician with lots of attitude. BAck in Boston, Jack's sister, Courtney, is left to hold the fort.
But Jasmine, the sultry Prowler who barely survived her run-in with them inBoston, has begun to build a new pack in New York. When Bill probes the Prowler underground, he finds old friends, secret alliances, and betrayal, and his predicament draws Courtney away from Boston on a quest to make sure the man she loves gets h ome safely.
To the norht, Jack and Molly uncover the truth - that the pack has grown larger than they could ever have ralized. With Prowlers all around them, they must reach out to all of their allies, dead or alive, if they are to save Bill and Courtney and survive the final conflict with Jasmine.
Great series about werewolfs.