Raining Cats and Detectives: Book 5 — Colleen A.F. Venable

It's a dark and stormy afternoon when Sasspants, PI(G), leaves Mr. Venezi's pet shop to live with a new owner. Soon there's a mystery afoot back at the shop: the cat from the bookstore next door has disappeared. All the pet shop animals are putting on their detective hats, but their fluffy-but-faraway guinea pig detective can't help them follow the clues! Can Hamisher the hamster solve this cat-napping without Sasspants? He's going to try his furry best not only to crack the case, but to reunite with his best friend and fellow sleuth too.