Through the window of their hotel room in the Toronto Blue Jays baseball stadium, cousins Mike and Kate spot strange blue lights flashing across the bullpen and decide to investigate.
When a beloved Dalmation goes missing while cousins Mike and Kate are in St. Louis for a Cardinals game, they rush to investigate and find a ransom note.
In New York City for the annual series between rival teams, the Yankees and the Mets, Mike and Kate investigate a spate of pranks, thefts, and sabotage.
"The president's brother is a catcher on the Nationals baseball team, and someone is stealing his equipment! Can Mike and Kate help the commander in chief catch a criminal?"--
Mike and Kate are volunteering in Cooperstown, helping wrap gifts for needy families, when a very valuable baseball card disappears, and they have a new mystery to solve.