Book #1 in the series is The Fenway Foul-up. Mike's mom is a sports reporter and gets all-access passes for Mike and Kate-- what could be better?! But when the Red Sox' star batter Big D's lucky bat goes missing, the kids take advantage of their passes, and begin to solve the mystery...inning by inning.
There are currently 7 available books in the Ballpark Mysteries series, and 2 more available for pre-order. My older son actually cashed in some Barnes and Noble gift cards to order numbers 2, 3, and 4 last night...and we have, of course, already pre-ordered the Phillies-feature book (#9)! There is a site dedicated entirely to the Ballpark Mysteries, and a blog written by 'Mike'. It was just updated to include a new "last" chapter for The Fenway Foul-up!
I highly recommend this series, especially if you have baseball fans and/or reluctant early readers in your house. Leveraging the love of baseball is a great solution to my son's lack of love of reading (it kills me, as a book-lover!!).
The Fenway Foul-up was written by David A. Kelly, published by Random House Books for Young Readers, February 2011.