When Robyn's new substitute teacher receives a threatening package, she sets out to find out who is responsible.

"Cocoa's convinced someone is sabotaging her dance class. She demands Malcolm and Dandy find out who it is - or else! After getting kicked out of rehearsal, the boys meet the ghost of an old teacher who hates the new music and moves, and especially the noisy boys. Can the Ghost Detectors zap her before the dance recital is canceled?"--Publisher.

Young secret agent Amelia investigates three new cases, involving an evil genius who makes dogs howl, a sneaky science teacher who buys too much cereal, and a psychotic criminal picking the pockets of toy shoppers.

Spurred by a special project from her social studies teacher, seventh-grader Bethesda Fielding uncovers the secret identity of her music teacher, which leads to a most unusual concert performance and a tutoring assignment.

On her first day of seventh grade MJ meets the nice new science teacher--but when Ms. Fleek finally gets the door to the laboratory, room 201, open she changes and suddenly MJ does not want to go anywhere near her or that room.

Neesha's friend Amy has been behaving very strangely since she joined Ms. Fleek's study group, ever so well behaved but remote--but Neesha misses her friend so much that she joins the group too, and immediately feels a change coming over her.

"When a substitute teacher turns up in Joey and Johnny's class, the boys quickly decide that she is a swamp creature, and after school they set out to prove it; they follow her home to the swamp--but Mrs. Gilman is not the only one living in the swamp, and if they are not careful the boys may find themselves on the dinner menu"--Title verso page.