The Enchanted Frost by Camille Peters

It is his duty to claim her frozen soul—he never expected to instead obtain her heart.

After her fall from grace, Blanche’s life has been one of struggle and misery that eventually meets its expected end when she freezes to death in an abandoned alley. But before she fully succumbs, she is instead taken to the snowy realm of the winter king, ruled by a handsome yet enigmatic being whose duty is to claim her frozen soul, a responsibility he has performed since time began.
Frost has spent his eternal existence in his kingdom of ice, using his powers to maintain the delicate balance of the seasons, a forever that has remained unchanging…until his magic inexplicably fails to capture one of the souls his cold has claim to, trapping her between life and death. Despite her harsh past, Blanche is somehow different than the other mortals that he’s observed from a distance, and Frost finds himself drawn to her…especially when a mysterious connection from their past emerges.
As Frost and Blanche work together to help her move on, mortal and immortal being find their worlds shifting the closer they become as hearts previously frozen soften with the warmth of their deepening feelings for one another. Yet this forbidden relationship sets off a series of events as Frost’s power over winter inexplicably begins to diminish, jeopardizing the balance of the world and the fate of all in it. Will this connection threaten to dethrone the King of Winter as well as interrupt the delicate cycle of seasons that Earth requires, or is love a powerful enough force to reweave the fabric of existence?