The Keys of Kalijor — Paul Lell

Betrayed and taken hostage, Katrina has been missing for six months now. Time in which Riana has been scouring the world for her. The first key is in Xavier's hands and the world is in danger if the rest of the keys can't be found. With the singing sensation, Resonance, leaving clues for her, the path Riana treads leads her and a small group of new friends straight to a dragon's doorstep, and into the real secrets unlocked by the five keys. But can she solve the riddle in time?

The second book in the Keys of Kalijor series, this novel picks up on the heels of The First Key of Kalijor, and keeps the pace toward an uncertain future for two worlds, and all the people in them.