For a land dying of hatred, the only cure is a vow of love.
Lyra of House Astoris has dedicated her life to logic and light. Her people are dying, the magic fading from their sun-drenched lands, and she is certain a scientific cure can be found. But when an ancient pact is invoked, her duty demands a different kind of sacrifice: she must marry her house's sworn enemy.
Darian of House Cinderfell is a warrior forged in shadow and steel. He knows the decay rotting his home is a prelude to war with the sun-worshippers of Helios, and he is ready to fight. The last thing he wants is to be chained by a marriage vow to their idealistic heir, a woman he sees as a deceitful political pawn.
Forced together on a perilous journey to a sacred site, they discover a truth more terrifying than their centuries-old rivalry. A parasitic evil has been feeding on their hatred, engineering their conflict, and poisoning their land. Now, bound by a power that only ignites when they unite, they are the only thing standing between the Vale and total annihilation. Their arranged marriage is no longer a political sentence-it has become the world's last hope, and the weapon they must learn to wield is each other.
Perfect for fans of Sarah J. Maas and Jennifer L. Armentrout, this epic fantasy romance is a journey of magic, intrigue, and a love so powerful it can heal a broken world.