Jamie and her family have just moved into their new house on a horseshoe-shaped street surrounding a playground. There is a lot to get used to at first. Her brother, Luke, has nightmares. Her sister, Becky, acts like a baby, and all three of them miss their grandparents whose house they had lived in until now. While Jamie's dad is at work and her mom works from home, Jamie is in charge of her brother and sister for the summer. At the playground, they are introduced to all of the neighborhood kids. Together, they teach each other their favorite games, make up new ones, go on many adventures, and end up having the best summer ever.