Blood Sun: Danger Zone by David Gilman
Desperate to uncover the secret of his mother's death, Max Gordon is chased into the night by a ruthless mercenary. His search takes him from the desolate hills of Dartmoor to the endangered rainforest of Central America - where the devastation hides a sinister secret. Drug smugglers, deadly crocodiles, man-eating snakes and flesh-stripping piranhas await Max at every turn. Has Max's quest for the truth led to an answer for which he'll pay the ultimate price?