Connor Sullivan, All-Star third baseman on his Babe Ruth League team, has a terrible temper and problems at home, but when the sports editor of the school paper threatens to publish an embarrassing story about his tantrums, Connor must make a change.

Thirteen-year-old Cody Parker moves to Baltimore, Maryland, where as a fat eighth-grader, he has to deal with brutal teasing from a baseball teammate, and his school is beset by a rash of mysterious thefts that threaten to sideline Cody and ruin a golden season for his team.