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The Third Grade Detectives (age 7-10) by George Edward Stanley math/science/technology ... school ... mystery Mr. Merlin's Third Graders are known as the Third Grade Detectives. With some hints from secret code clues and help from Mr. Merlin's friend, the police scientist Dr. Smiley, they help solve cases. title: The Clue of the Left-Handed Envelope; The Puzzle of the Pretty Pink Handkerchief |