One girl carries a forbidden fire that could save a kingdom-or burn it to the ground.
Annabelle was nothing more than a stable girl, "human debris" swept away by a noble's pen. But when a nightmare from the shadows slaughters her caravan, a power she never knew existed erupts: a blinding cyclone of sapphire flame that leaves only ash in its wake.
Exiled to the prestigious Academy stables in the vertical city of High Canopy, Annabelle must navigate the whims of high-born mages and the iron rule of the Mistress of Horse. To survive, she must stay invisible, but you cannot hide when you are burning from the inside out.
As a mysterious rot spreads through the capital and a dark prophecy whispers of an apocalypse, Annabelle realizes the wolves are already at the King's table. Alongside Karvo, a brilliant scholar who sees the princess beneath the soot, she must master her "Azure Resonance" before the shadows consume everything.
The stable girl is gone. The Princess of the Sapphire Flame has arrived, and the High Canopy is about to burn.