(Random House) 5 Worlds: The Cobalt Prince Oona Lee surprised everyone–including herself–when she lit the first beacon to save the Five Worlds from extinction. Can she light the other four beacons in time? Next stop, Toki! On the blue planet, Oona must face the sister who left her, and bring to light the Cobalt Prince’s dark secrets. Meanwhile, An Tzu is fading away as his mysterious illness gets worse. Will it stop him from joining the fight?