Spark: The Skychasers Trilogy 2

Teenagers Waverly and Kieran were the first boy and girl born in space, and the first to fall in love. Cruelly wrenched apart when the enemy ship the New Horizon attacked the Empyrean, they have finally been reunited. Now the young crew on board the Empyrean must chase down the other ship in the race to save their parents. But Kieran's leadership methods have raised suspicions, and Waverly questions if this could really be the same handsome loving boy she was torn from such a short time ago. Meanwhile she finds herself drawn ever closer to the wild and unpredictable Seth, despite the accusations Kieran has levelled against him...