The Poisoned King by Katherine Rundell

When Christopher Forrester is unexpectedly woken by a miniature dragon chewing on his face, his heart leaps for joy. For months he’s dreamed of returning to the Archipelago – the secret islands where all the creatures of myth still live.

But he did not know it would involve a rescue mission on the back of a sphinx, or a plan to enter a dragon’s lair. Nor did he imagine it would involve a girl with a flock of birds at her side, a new-hatched chick in her pocket and a ravenous hunger for justice... 
 
'There was Tolkien, there is Pullman and now there is Katherine Rundell' MICHAEL MORPURGO.