Infinite Dark

After surviving an alien invasion that nearly destroyed New York City, Penelope Simmons is beginning to accept the truth: Rowan, the Volkranian she fell in love with, is gone for good, and it's about time she and the rest of humankind adjusted to Earth's newest inhabitants. An old enemy has tracked the Volkranians to Earth, hunting for the baby prince stolen from them long ago--Rowan--and they will stop at nothing to reclaim him. The Indoori know he will do anything to save Pen and hundreds of abducted human prisoners from a fate worse than death, and that's exactly what Pen fears too. (from back cover)