Blade and Border

A sorceress queen sits on the throne, and a curse is coming. Can an assassin an elf stop her before it's too late?
Rory, elf mage and agent of the Council of Maireadd, is tasked with guiding a suspected spy through the elves' cursed forest, befriending him, and finding out what his mission is. But when they're targeted by dark forces, and then spot a mythical unicorn, a harbinger of fate, she realizes her own mission might be more than anyone bargained for. Worse, she might be falling in love with her human assignment. 
Sean Leigh, chef, spy, and occasional assassin, needs to eliminate Dianthe, the witch queen, before she brings ruin both on her own country and those surrounding. But that's not going to be a simple chore, with tensions rising between humans and magicals, and the queen herself armed with powerful magic. He's only human, after all. 
Can Sean and Rory's friendship overcome race, borders, monsters, and unseen evils to save not only their countries but each other?