From his seat in the tiny aeroplane, Fred watches as the mysteries of the Amazon jungle pass by below him. He has always dreamed of becoming an explorer, of making history and of reading his name amongst the lists of great discoveries. If only he could land and look about him.

As the plane crashes into the canopy, Fred is suddenly left without a choice. He and the three other children may be alive, but the jungle is a vast, untamed place. With no hope of rescue, the chance of getting home feels impossibly small.

Except, it seems, someone has been there before them.