When their dog, Thums-up, disappears one night and two enormous flying horses appear, ten-year-old twins Kinjal and Kiya are forced to follow them to the mysterious Sky Kingdom. There they must use Kinjal’s love of books and language and Kiya’s scientific skills to find out why bees are disappearing with the nectar the winged pakkhiraj horses need to survive—and hopefully save their dog too.