Hi-Mount School is in crisis! Mr. Humphrey, the school janitor mysteriously stopped showing up, leaving Drama Teacher Ms. McGery to take up his place. Beloved Lunch Lady Linda has mysteriously disappeared without a trace, and there’s a mysterious wallet with some disturbing notes found in Custodia!
When Drama Club member (and amateur sleuth) Foster has to bring the dead classroom goldfish down to Custodia–a mysterious area of school where janitors roam and rumors abound–she gets more than she bargained for when she takes up the case! Enlisting the help of her fellow drama club members, and trying to hold the meddlesome school reporter at bay, Foster tries to solve the greatest mystery of them all: The Mystery of Custodia.