Correst - The Books of Tanil, #2

Luke Toft always did his best to ignore his daughter Aito's stories of another world and the country in it called Tanil. He thought they were just make-believe, all from her imagination and a book he's starting to wish she'd never found. So when he sees his daughter disappear before his eyes and finds a definitely not human half-breed in his backyard who claims that she's been pulled back into Tanil, Luke thinks he might be going crazy.
Madness would almost make more sense than finding himself in the world of his daughter's stories, pretending to be a soldier and trying to fit in in a world where humans no longer exist. All the while he's just trying to find the person behind his daughter's disappearance, a feat that seems impossible with people from all over Tanil and its northern neighbor Rorin gathering together to create a treaty that will decide the fate of two countries.
Luke has to move fast though, because the longer he stays in Tanil the more people take notice of this new recruit. He's not the only one searching for Aito, and with the treaty on the line more than a few people are looking for any useful piece they can get, or for the perfect wrench in the works.