Katherine Rundell

Christopher discovers the Archipelago, a world where mythological creatures were secreted away by magic long ago, but those creatures are now dying, and it is up to Christopher and Mal, a girl from the Archipelago, to save both of their worlds.

When authorities threaten to take Sophie, twelve, from Charles, who's been her guardian since she was one and both survived a shipwreck, the pair go to Paris to try to find Sophie's mother, aided by Matteo and his band of "rooftoppers."

Left stranded in the Amazon jungle when their plane crashes on their way back to England from Manaus, Brazil, four children struggle to survive for days until one of them finds a map that leads them to a ruined city and a secret hidden among the vines.