Blood Sun — David Gilman

Deep in the London underground, a train shudders across an unseen body. Days later, on the bleakness of Dartmoor, Max Gordon learns of a fellow student's death in the capital. Danny Maguire was carrying an envelope with Max's name on it -- containing the secret of Max's mother's death. The clues take Max into the endangered rainforest of Central America where, hunted down by a ruthless killer, he must also escape the jaws of deadly crocodiles and flesh-eating piranhas. The truth Max is desperately trying to uncover lies deep within the dangerous forest's heart . . . if only he can stay alive to reach it.