Junior and his father, Ben, move from Cold River to Mortville. Junior becomes threatened by Ben's desire to date again and find a new mother for Junior, and sabotages each of his dates.

Ben Healy and his social climbing wife Flo adopt fun-loving seven year old Junior. But they soon discover he's a little monster as he turns a camping trip, a birthday party and even a baseball game into comic nightmares.

Chapter 3 of the Problem Child trilogy features pre-teened Junior in love with a classmate that won't even notice him, but does notice three other boys who are rivals to Junior. This means war!