Christine Boylan 
Prism of Midnight Dawn, Volume 2 [PDF ebook] 

In this second trilogy based on a concept by Courtney Love, an alien princess held hostage on her own planet fears for the fate of the man she loves.   Ai fights to escape the clutches of her mysterious and malevolent captors, not knowing whether Kent, left behind on the Other Side, is even still alive. A frantic rescue mission commences, and in the end, even Ai's magical voice may not be enough to protect her from the trials of the Black Forest. Dark secrets are revealed, and Ai must use all her strength and courage to face off against the new threat to Ai-Land. But will she ever see Kent again. . . ?   “Terrific.” —Publishers Weekly on Princess Ai,  volume 1