While spending the summer in the Amazon rain forest of Brazil doing botanical research, thirteen-year-old Grady discovers a secret language used by the trees to communicate with each other and falls afoul of the dictatorial Dr. Carter, whose motives seem questionable.

While spending the summer in the Amazon rain forest of Brazil doing botanical research, thirteen-year-old Grady discovers a secret language used by the trees to communicate with each other and falls afoul of the dictatorial Dr. Carter, whose motives seem questionable.