Preludes to War — Joe Jackson

When a demon king demands the repayment of a favor, Kari finds herself prisoner to his wishes. But all is not as it appears... Working behind enemy lines, Kari must turn the unexpected into an advantage. War between the worlds of Citaria and Mehr'Durillia is inevitable, but the question of where it will be fought lies in her hands. If she can strike just the right blow, Kari may keep the battle far from the realms of her people. If she can gain the blessing of a demon king, the acceptance of an enemy people, and the love of a demoness, can she restore the faith of a people enslaved for over ten thousand years?