The Chaos Monster (Secrets of the Sky #1)

EVERYTHING IS CONNECTED TO EVERYTHING, AND IT'S UP TO TWINS KIYA AND KINJAL TO SAVE IT ALL
Ten-year-old Kinjal knows something strange is going on. But he does not expect his dog, Thums-up, to disappear before his eyes in the middle of the night! Even stranger, two enormous flying horses appear and insist on taking Kinjal and his twin sister, Kiya, to a place they have never heard of: the Sky Kingdom. The twins have no choice but to go if they want to see their dog again, even if that isn't why the winged pakkhiraj horses showed up in the first place. They have come to this dimension to seek help -- bees are disappearing, along with the nectar the horses need to survive.
Whisked away to a magical realm, the twins must use Kiya's scientific skills and Kinjal's love of books and language to help the horses. Once there, they discover that the disappearance of the bees is more nefarious than they thought, and the plot goes all the way to the top.