Worried that her parents are breaking up, Sophie gets lost in an imaginary world again as she and her friends transform Fiona's tree house into a space station as a school science project, despite sabotage and jealousies.

When a knee injury and a subsequent mistake threaten to end her basketball career, athletically driven Cassidy finds support in the most unlikely places--including a room filled with juvenile delinquents and the pages of an old book labeled "RL."

As the sixth-grade dance approaches, Sophie turns to Dr. Peter and Jesus for help while trying to cope with her new feelings towards boys and with new tensions within her group of friends, the Corn Flakes.