Island that didn't exist (Oxford University Press)

When twelve-year-old Rixon's great-uncle leaves him an island in his will, Rixon can't quite believe it. Things get even more confusing when the mysterious island can only be located on a very ancient map, and only then by using a big magnifying glass. Does the island actually exist? And if so, does it really belong to him? There's only one thing for it. Rixon is going to have to go there and find it for himself. And what he finds when he gets there might just hold the key to the future of the planet: four children hidden away from society with an altogether different set of values. But soon Rixon is fighting for his own life, left in a cave with a rising tide, floating out to sea on a leaky inflatable and fending off the attacks of a multimillionaire tech giant and his super yacht. Can Rixon keep the island's secrets? And will he even want to...?