Dragon Mountain - Katie Tsang - Bog

When 12-year-old Billy Chan finds out his parents are sending him to a camp in the middle-of-nowhere China, he can't imagine anything worse. He's not expecting to become friends with his fellow campers Dylan, Charlotte, and Liu. And he's definitely not planning to meet dragons. But when the kids accidentally open a crack in an ancient mountain, they become involved in an ages-old struggle of good versus evil. Now they must save the Dragon Realm--or their world might disappear forever.