Dial M for Mongoose: A Chet Gecko Mystery (Chet Gecko, 15)

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.