Half Moon and his partner in crime-busting, former bad boy Red Sharkey, try to discover who is behind a particularly nasty smear campaign in the school. When Red's brother, Herod, is elected as Year Rep, he instigates some wacky but popular measures in the school and his stock seems to be on the rise. But when pictures of Herod smashing the headlights of Headmistress Quinn's car appear all over the school, it becomes clear that a smear campaign has been launched by a mysterious foe. Quinn is on the warpath, and clearing Herod's mud-splattered name becomes a top priority for private investigator Moon and his partner Red. The main suspects are Herod's rivals in the presidential race, but could the true culprit be much closer to home? Meanwhile, Hazel and Genie are forced to collaborate over a writing exercise which soon puts them on an explosive collision course with each other.