Book excerpt: For Zack Allen, it was supposed to be a chance to get away and relax. A weekend camping trip with a small group of friends seemed like the perfect distraction from a messy personal life, but as Zack and his friends made their way to the camping ground at Drifter's Folly Memorial Park, he couldn't shake the feeling something was terribly wrong. Zack should have listened to his gut, because he and his friends aren't the only ones in the forest. Someone else is watching-someone with dark intentions. And he wants to play a game...