Tui T. Sutherland 
Hidden Kingdom [EPUB ebook] 

The WINGS OF FIRE saga continues! Deep in the rainforest, danger awaits . . . The dragonets of destiny aren’t sure what to expect in the Rain Wing kingdom — Glory hopes to learn more about her family, and since the Rain Wings aren’t fighting in the war, all five dragonets think they might be able to hide safely for a while. But something deadly is stalking the peaceful kingdom, and the dragonets soon discover that Rain Wings have been mysteriously disappearing from the forest. When the Rain Wing queen won’t do anything to find her missing tribe members, Glory and her friends set off on their own rescue mission — which leads them right back into enemy territory. . .