It’s baseball season in Ivy Bay, and the entire town is cheering for its team, the Blue Jays. Mary has agreed to help organize and maintain an exhibit of baseball memorabilia at the town hall, even loaning her late husband’s prized possession: a ball signed by the 1970 Red Sox. But while straightening the display one day, Mary realizes her husband’s ball has been switched for a fake. Who pulled off such a clever forgery? Soon other items are discovered to be phony as well, and Mary has quite a mystery on her hands! The playoffs mean Ivy Bay is full of people who love baseball and baseball memorabilia. As Mary investigates, she discovers her husband’s ball is worth far more than she ever imagined and that he had intended to donate it to a children’s charity before he died. Mary wants nothing more than to fulfill his wish, but she has to find the thief—and the baseball—first!