More than she can handle... Jessica Wakefield can't wait for the school fair - until she gets stuck in charge of the water-balloon booth. Who wants to be drenched by every kid at Sweet Valley Middle School? So when her twin sister, Elizabeth, is offered a baby-sitting job that day, Jessica sees the perfect opportunity to steal the job away and stick her sister with the water-balloon booth. But Jessica's plan backfires. The kids she baby-sits turn out to be real monsters. The minute their parents leave, they begin tearing up the house - and her! Jessica needs help fast. But will Elizabeth feel too betrayed and too wet to come to her sister's aid?