Hiss Me Deadly (A Chet Gecko Mystery: Book 13) by Bruce Hale
A crime has been committed that strikes at the heart of Chet's very own family. Some slippery sneak has stolen his mother's beloved pearls, leaving Chet angrier than a nest of hornets on eviction day. When additional items go missing, Principal Zero turns up the heat by hiring Chet to flush out the thief. Will our gecko hero deliver the goods before it's too late? He'd better. Because this time, it's personal.
This thirteenth entry in Chet and Natalie's tattered casebook is chock-full of the hilarious characters, wacky one-liners, and fast-paced mystery that have made this series a favorite among middle grade readers.