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...