Absolutely, positively, not. Fifteen-year-old Belinda Larsen wants nothing to do with a trip to the Mexican jungle with her parents and bratty younger brother. Twelve-year-old Jack has other ideas about the upcoming family an isolated island, a forest full of snakes, and scuba diving with his dad. Paradise. Then Jack gets a headache that won't go away, and bruises he can't explain. What happens now?