Eight-year-old twins Zach and Zoe follow clues to find Zach's missing baseball, signed by his favorite major league player, while competing in Spirit Week events at school.

When they go on a field trip to a pop-up museum sponsored by the National Baseball Hall of Fame, eight-year-old twins Zach and Zoe discover an empty display case and with the help of their friends, they figure out what happened.

With only days before the last game of the Stanley Cup finals in Boston, eight-year-old twins Zach and Zoe are determined to find hockey star Mike Gordon's missing lucky necklace.

"Zach and Zoe find their recess football deflated from a hole near the laces, and set off in search of clues to discover how it happened."--