By David A. Kelly
Two cousins on a road trip to real ballparks, solving a small mystery at each one.
Cousins Mike and Kate are at Fenway Park in Boston when the team's star slugger has his lucky bat go missing right before a big game. Mike knows his baseball and Kate keeps her eyes open, and together they work through the clues to track down the bat and the culprit. It's the first stop on a series that visits a different real ballpark in every book.
It's a clean, satisfying mystery a young reader can actually solve alongside the cousins, with clues laid out fairly and no scary stakes, just a missing bat and a game to save. The chapters are short, and because every book visits a new real ballpark, a baseball-loving child has a whole league of them to collect.