As war spreads like wildfire, the Smoke Thieves face their greatest challenges yet. With her father tightening his grip on the Northern Plateau, Catherine sends her loyal bodyguard Ambrose into the dragon's den on a desperate mission to disrupt the supply of smoke. But as the battle for the human kingdoms reaches its climax, the demon realm reveals a final, terrible secret. 12+ The final book in the acclaimed Smoke Thieves trilogy.