In this novel told through letters, newspaper articles, and police reports, a middle school principal's bathroom renovation project leads to the discovery of stolen Roman antiquities.

When the new penguin at school turns out to be a private eye, Chet Gecko confronts not only a devious sparrow but also his own jealousy.

Detective Chet Gecko and his associate, Natalie Attired, take a case tailing what they think is a cheating boyfriend but are instead led to a school mystery that involves blackmail and robots.

Matt Stevens, an average middle schooler with a glib tongue and a knack for solving crimes, uncovers a mystery while working with "the organization," a mafia-like syndicate run by seventh-grader Vincent "Mr. Biggs" Biggio, specializing in forged hall passes, test-copying rings, black market candy selling, and taking out hits with water guns.

To save his own skin, private eye Chet Gecko sets out to solve the mystery of Emerson Hicky Elementary School's disappearing football players.

Chet Gecko and his partner Natalie try to find a missing valentine and the winning ticket to a fantastic dessert.

Having earned a scholarship to a private girls' high school, self-proclaimed psychic investigator Gilda Joyce investigates the circumstances surrounding the drowning death of a student whose ghost supposedly haunts the campus.