Kiwi and the Serpent of the Isle. Kiwi (the magical cat), #4

Book 4 in the Kiwi Series about a magical cat. The wedding of Inspector Furrball and Madame Purrfect approaches. But, catastrophe, the ring is stolen from the Gem Shop! A pawprint identifies Fyre Cracker as the thief, but he lives in the dark world of the UnderPaw beneath Cat City, inhabited by crimicats. It's up to the Kiwi Klub to find the ring. In the human world, the hamsters decide to stand up for their rights to better plastic wheels and an abundance of sunflower seeds.
Meanwhile, the dastardly Dev shocks Kiwi with the news that he knows a big secret about her family - that her father, Delphinius, may still be alive! The key is The Sculptor, who will lead Kiwi and friends on their biggest adventure yet - to the strange Isle of the Serpent, where they will come face to face with their most dangerous adversary so far. Ages 8-99. Finalist in the National Indie Excellence Book Awards 2013.