In a snow-cloaked kingdom, now is a time for mischief and revelry. For the next few weeks, all will be wintry balls, glittery disguises, and nightly torch-lit sleigh-parties.

But unbeknown to the merrymakers, two uninvited girls join the fun. Zosia and Marynka are drawn to each other the moment they meet – until they discover they're rivals, who both have their sights set on the prince's heart. If one consumes a pure heart, she'll gain immeasurable power. Marynka plans to bring the prince's back to her patron in order to prove herself, while Zosia is determined to take his heart and its power for herself.

Their ambition turns into a magical contest, even as their attraction to one another grows. But their attempts on the prince's life draws the attention of the city that would die for him, and their escalating rivalry might cost them not only their love for each other but both their lives.