Dragon Mountain by Katie Tsang

Beast Quest meets Percy Jackson in this epic new middle-grade fantasy series! Deep within the mountain, a great creature stirred in its sleep. Its eyes rolled back in its head, and its wings jerked wide open... When 12-year-old Billy Chan finds out his parents are sending him to a summer camp in middle-of-nowhere China, he doesn't know what to expect. There he meets fellow campers Dylan, Charlotte, and Ling-Fei, and together they stumble upon an age-old secret: there are four powerful warrior dragons hidden deep within the mountain behind the camp! They need the children's help to set them free before terrible evil in the guise of the Dragon of Death is unleashed upon the earth. Billy and his friends must set off on a dangerous adventure that will take them to the heart of the Dragon Realm. But can they save the dragon and human worlds from destruction?