Boy X by Dan Smith

Kidnapped and drugged, Ash wakes up on a remote tropical island. His mum – a genetic scientist – has been imprisoned and infected with a deadly virus. Where is he, and what’s he doing there? He sets out to cross the jungle to find out and rescue his mother. Soon he realises he’s quicker and sharper than before. But there’s something else …why are the animals watching him, and how can he use the jungle to his advantage?