Stella and her brother Max, of the Brite and Brite Detective Agency, put the mystery of Mayor Pickle's missing Pekingese on hold as they join the astronomy club in researching the problem of invisible dark matter in the universe.
Chip, an invisible boy, and his friends investigate the mysterious disappearance of yogurt-covered raisins, mixed nuts, and ginger snaps from their classroom.
The Clue Crew gets the chance to visit a movie set thanks to one of Mr. Drew's connected clients, but fun turns to business when the film's star, famous feline Fluffington, disappears.
When hard-shelled detective Humpty Dumpty, Jr. investigates the break-in of the Pat-a-Cake Bakery and the kidnapping of its owner, the trail of clues leads to a ne'er-do-well pancake.
The Bailey School kids decide to investigate when rumors fly that Mr. Bigg, the dirt-loving, cat-hating man who is fixing up the park for the town Easter egg hunt, is really an ogre.
The Alden children visit a family friend at his apple orchard which is rumored to be haunted, but instead of a ghost they find that some of the family's valuable antiques are being stolen.