Mac can't lose another friend.

Even if he doesn't want to be found.

The ripple effect caused by Mac's best friend Amy's murder has driven Mac's new love, Kyle, to leave Hemlock and disappear from her life forever. But Mac knows that Kyle plans to enroll in a rehabilitation camp, where he can live with other werewolves. She refuses to accept his decision, especially since the camps are rumored to be torturous. So she sets out in search of Kyle with barely sober pal Jason—and Amy's all-seeing ghost—in tow.

Clues lead Mac to find Kyle in a werewolf den in Colorado—but their reunion is cut short by a Tracker raid. Now Mac and Kyle are trapped inside the electric fences of Thornhill, a camp for young werewolves. As she devises an escape plan, Mac uncovers dangerous secrets buried within the walls of Thornhill—and realizes that the risk to the people she loves is greater than ever before.

A skillfully plotted supernatural mystery with heart-stopping action and a compelling romance, Thornhill is Kathleen Peacock's extraordinary follow-up to her debut novel, Hemlock.