Robert Arthur begins the seventh grade at a strange new school that has two-headed rats and mysterious labyrinths, in addition to the mean Professor Goyle who is seemingly unconcerned when students begin vanishing into thin air.

Twins Sarah and Sylvia Price, two monsters in disguise at Lovecraft Middle School, are campaigning for student council with a secret plan to abduct the entire seventh grade, and Robert Arthur and his strange friends must stop their evil plot.

Strange things are happening at Lovecraft Middle School. Rats are leaping from lockers. Students are disappearing. The school library is a labyrinth of secret corridors. And the science teacher is acting very peculiar ... in fact, he just might be a monster-in-disguise. Twelve-year-old Robert Arthur knew that seventh grade was going to be weird, but this is ridiculous!