The local library has received a boatload of books from a mysterious donor -- only the latest in a series of impressive gifts being given around town. The detectives take the case to track down The Helpful Hero and thank them, learning just what it means to be a helpful member of their community, and what it means to volunteer to help others. / The County Fair is in full-swing, and Mike's Uncle Chuck is expecting a banner night at the dinner. Mike is roped into waiting tables only to find out a newspaper food critic is planning a visit. The detectives work to deduce the critic's secret identity by learning as much as they can about the jobs of every customer the diner serves.