And Then There Were Gnomes: Book 2 (Guinea PIG, Pet Shop Private Eye)

Sasspants, PI(G), the world's fluffiest detective, is back on the case―or she will be, if her sidekick Hamisher can convince her there's really a mystery afoot. Hamisher has made up so many stories, Sasspants doesn't believe him. But one by one the mice in Mr. Venezi's pet shop are going missing, and all the spooky clues point to...a ghost! Once our shaggy Sherlocks start digging for answers, they will stop at nothing to ferret out the truth!