nA group of third graders solve fun mysteries in this collectible boxed set that includes all six books of the Third-Grade Detectives series nThis collectible boxed set includes: n The Clue of the Left-Handed Envelope n The Cobweb Confession n The Mystery of the Hairy Tomatoes n The Puzzle of the Pretty Pink Handkerchief n The Riddle of the Stolen Sand n The Secret of the Green Skinn