AN EXERCISE IN CRIME SOLVING The Greenwood Cup competition is THE gymnastics event of the year, and the Bobbsey twins are all big fans. Freddie and Flossie are helping Bert to videotape the contest, and Nan is hoping to take part in her school team's acrobatic demonstration. Lakeport's local favorite to win is Mary Lee Chin. But someone is out to make the star gymnast take a tumble. Equipment has been sabotaged, videotapes have vanished, and all the evidence points to Mary Lee! The twins will have to be quick-witted and quick on their feet in order to catch the real culprit in the act.
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