Any seven-year-old boy like Zack can tell you that one sister is plenty. So what's a boy to do when he has two sisters, one bigger and one smaller? Beginning readers will giggle and groan as they watch Zack manage the tensions and pleasures of being the middle child. With a busy and bossy big sister ahead of him and a mischievous and messy little sister behind him, Zack learns to love being surrounded.