Spark (Sky Chasers #2)  By: Amy Kathleen Ryan Published: July 17, 2012 by St. Martin's Griffin 385 pages Source: Personal Kindle Library (gifted from Christmas) ( Goodreads / Amazon ) Summary: Waverly and Kieran are finally reunited on the Empyrean. Kieran has led the boys safely up to this point, and now that the girls are back, their mission seems slightly less impossible: to chase down the New Horizon, and save their parents from the enemy ship. But nothing is truly as it seems…Kieran’s leadership methods have raised Seth’s hackles— and Waverly’s suspicions. Is this really her fiancé? The handsome, loving boy she was torn from just a short time before? More and more, she finds her thoughts aligned with Seth’s. But if Seth is Kieran’s Enemy No. 1, what does that make her?  In one night, a strange explosion rocks the Empyrean—shooting them off course and delaying their pursuit of the New Horizon—and Seth is mysteriously released from the brig. Seth is the most...