The world is no longer safe for the Dragon Rider Murtagh and his dragon, Thorn. An evil king has been toppled, and they are left to face the consequences of the reluctant role they played in his reign of terror.

Now they are hated and alone, exiled to the outskirts of society. Throughout the land, hushed voices whisper of brittle ground and a faint scent of brimstone in the air - and Murtagh senses that something wicked lurks in the shadows of Alagaësia. So begins an epic journey into lands both familiar and untravelled, where Murtagh and Thorn must use every weapon in their arsenal, from brains to brawn, to find and outwit a mysterious witch. A witch who is much more than she seems.