Crimson Rising #2: Skyship Academy by Nick James (Very good, 2013, Pbk, 355 pages, Scholastic)

Following their dramatic showdown in Seattle, Jesse Fisher and Cassius Stevenson find their world's been turned inside out. The faculty at Skyship Academy is keeping Jesse a prisoner in his own home, fearful of his influence over Pearls. And Cassius, once a loyal Pearlhound for the Unified Party, has been pushed into hiding, fearful of his government's retaliation.

When Jesse smuggles a mysterious red Pearl onboard the Academy, he sets loose a destructive chain of events, which lead him to a reunion with Cassius and a confrontation with Theo -- a bloodthirsty Pearlhound with a dangerous secret. 

But a larger threat looms in the stars. An enemy is gathering, with plans to exterminate the entire human race. And Jesse and Cassius might just be the lynch pins that trigger mankind's destruction.