Despite a spring vacation spent with her beloved grandmother, Abby is concerned because her enemy cousin, Cleo, will be there as well, leaving Abby to wonder if they will ever get along.
Abby is glad to be graduating from fifth grade and is looking forward to the summer, but when her mom's college friend shows up for a visit along with her daughter, Wynter, and Abby gets stuck babysitting, things go downhill quickly.