After Eternity - Eternal Romances, #1

How do you fall in love with your adversary? Jack Frost is third in line to his brother's kingdom, and tasked with guarding the children of the mortal realm. Briella Snow is the Snow Queen of the kingdom of Tundra, and rumored to be fond of abducting mortals. When a boy living in the mortal realm goes missing, Jack knows that there could be no other possible culprit. His suspicions are confirmed when he actually meets Briella.
She's pompous, she's powerful and she's an icy cold pain in the neck. Then Jack realizes that her icy facade is just an illusion to keep others from discovering her true motive - securing the safety of the supernatural realm against goblins. The Snow Queen offers Jack a compromise: she will show him where the boy is in exchange for his helping to misdirect the goblins away from her castle. Both knew they would be risking their lives, not only against the goblins but also each other.
What they didn't expect was that they'd be risking their hearts as well.