Lyra of Oakhaven practices an alchemy of the soul, her 'untamed lacquer' a living song that defies the Guild's rigid formulas —and marks her as a heretic. Bound to the mysterious Listener, her every success is shadowed by the knowledge that her sister's life hangs in the balance.

Then comes Lord Cassian Valerius: handsome, arrogant, and the Guild's golden boy. Forced into an unwelcome alliance to combat a creeping alchemical blight, their journey is a clash of ice and fire, of dogma and intuition. But as they face monstrous creatures, ancient evils, and assassins in the dark, an unexpected resonance sparks between them—a dangerous, undeniable harmony.

With a conspiracy tightening its grip on Eldoria, and her own power proving as deadly as it is healing, Lyra must decide if trusting her heart is a greater risk than unleashing the full, wild force of her song.