Stosh thought his time-traveling days were completely behind him. But when legendary baseball player Ralph Branca appears in his bedroom in the middle of the night, Stosh is pulled into one final, high-stakes adventure. Branca needs help fixing a massive mistake from 1951. He threw the pitch that became the famous Shot Heard Round the World, a home run that won the pennant for the New York Giants. Now, Branca claims the Giants were cheating, and he wants Stosh to use his magical baseball cards to go back in time and change history. Stosh is eager to help, but he soon discovers a huge problem. Changing the past is incredibly dangerous. If he stops that famous home run, he might accidentally erase the career of a young rookie named Willie Mays! Stosh must make an impossible choice between correcting a past wrong and protecting the future of a baseball legend.