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Cousins Mike Walsh and Kate Hopkins are watching batting practice at Fenway Park when Red Sox slugger Big D's lucky bat is stolen, and with Big D in a slump, Mike and Kate rush to find the bat before the Sox lose the game.

Cousins Kate and Mike visit Kate's father, a baseball scout for the Dodgers, in Los Angeles just as a series of suspicious events lead him to think that someone is trying to steal his scouting reports.

While visiting Houston, Texas, Mike and Kate tour the Johnson Space Center with an astronaut in the morning and at the Houston Astros' ball game that evening, the cousins search for the person who steals the astronaut's moonrock when he arrives at the stadium to sign autographs.

Edward "Egg" Garrison and his friends are on a field trip to watch the local minor league baseball team, but a theft at the concession stand is delaying the game, so the four sixth-grade detectives decide to investigate.