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.
Nancy and her friends open a lemonade stand in the park, but they find themselves out of business and on the trail of a mystery when their box of lemons is stolen.
When the class hamster goes missing from Room 11 on the same day they have an awful substitute teacher, hamster-phobic student Smashie McPerter and her best friend, Dontel, experience increasing paranoia as every likely suspect produces an alibi.
When the spacesuit of famous astronaut Sally Ride disappears from a traveling exhibit, Amal Farah, daughter of the Air and Space Museum's archivist, and her three friends, are determined to find the culprit before the exhibit is cancelled.
Having a tough time adjusting to the increasing competition on her track team and challenging friendships, Maddy soon discovers that a friend is being bullied and another team member has been robbed, two events she believes are connected.
Nancy and her friends investigate when money disappears from the Pencil Box's cash register, but when the clues point to the clerk, Rodger, Nancy refuses to believe he is responsible.
"When the Thea Sisters' friend Ashvin is in trouble, they rush to his aid--in India! Ashvin has been working to return the monkeys living in the big city to their natural jungle environment. But the monkeys have suddenly started stealing jewels! Can the Thea Sisters figure out who is behind this terrible theft?"--P. [4] of cover.
