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Chet Gecko’s investigations often show him the seamy underbelly of school life, but this case throws him for a loop. A deadly stink bomb is unleashed, a school building falls to rubble, money goes missing from the principal’s office, and that’s just a start. Chet’s endurance for trouble is tested, but so is his loyalty: Someone is trying to get his mongoose janitor pal Maureen DeBree fired. A true-blue P.I. doesn’t take that kind of monkey business lying down. Standing up, maybe.And stand up he will—to some very shifty school bullies. Chet keeps digging for the truth like a mole after an earthworm sandwich. Oh, foolish detective.

Danger may be Chet Gecko's business, but dessert is his delight. . . .
Chet Gecko's hunger for mystery is matched only by his appetite for cockroach casserole, mosquito marshmallow surprise, and stinkbug pie. So when the cafeteria needs help nabbing a food thief, Chet digs into the case with a passion he usually reserves only for dessert. But this time Chet may have bitten off more than even he can chew.
Someone has framed him, and now everyone at Emerson Hicky--even his trusted partner, Natalie Attired--thinks the food thief is none other than Chet!

Inventions, spells, and bullies—oh my!

It all begins when Chet’s favorite teacher is fired, only to be replaced by the mechanical invention of Dr. Tanya Lightov—a mysterious Russian scientist.
Suddenly, the school seems possessed by forces that are upsetting the natural order of things: Kindergartners are beating up sixth graders; teachers’ pets are talking back; and worst of all, Chet’s faithful partner and best friend, Natalie Attired, has abandoned him in his hour of need.
Will Chet be able to restore his friendship with Natalie and bring Emerson Hicky back to normal? One thing’s for certain: The crazy, mixed-up mastermind behind this case will be the last creature anyone expects.

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.

Chet Gecko loves a good mystery. Almost more than he loves his fee--stinkbug pie.
So when fellow fourth grader Shirley Chameleon asks him to find her missing brother, Billy, Chet expects the case to be as easy a pie. But Billy's disappearance is part of a larger plot, one that involves the Rat Sisters, a riddling junkyard dog, and a vicious Gila monster named Herman. If Chet doesn't solve the case fast, the entire school could be humiliated. Worst of all, Chet might not get his fee. And Chet's hungry.