When her dog Rover is accused of tearing up Mrs. Ruston's tomato plants, Noelle investigates with her friend Todd and finds long yellow hairs that may point to the real culprit. Hair, hair, everywhere, someone's been digging up Mrs. Ruston's tomatoes. She thinks it's Noelle's dog, Rover, and unless Noelle can find the real thief, Rover's in big trouble. It's the hairiest case yet for Mr. Merlin's Third-Grade Detectives. Hair in Mrs. Ruston's tomato...

Heart must hide her beloved unicorn, Moonsilver, from Lord Dunraven's hunters. She and her animal friends join a troupe of traveling minstrels. Everyone thinks Moonsilver's horn is fake--just part of the act. Then Moonsilver heals a badly injured boy and the unicorn's secret is in danger. Can Heart's mysterious silver bracelet help her find the one place Moonsilver might be safe?

Heart is convinced that the old man from Castle Avamir can help her find her family, but the old man has been taken prisoner by Lord Dunraven.

The Third-Grade Detectives are looking forward to their field trip to a local art museum, where a priceless fifteenth-century statue of Joan of Arc is on loan from a Paris museum. But they discover the statue has been stolen. The police find the statue smashed and thrown in a Dumpster. It looks like a case for the Third Grade Detectives even if the museum director doesn't want their help.

Nancy, George, and Bess have been invited to an April Fool's Day party at their new schoolmate's house, with each guest bringing a gag to the party and the best prank winning a special prize. When two of the guests' fancy new electronics go missing, Nancy knows it's no joke, and the Clue Crew are on the case to find the missing gadgets.