This is a great story about sibling rivalry, especially when the younger child seems to be more talented than the older. Evan is going into 4th grade and has added pressure this year because his younger sister, Jessie is skipping a grade and will also be in 4th grade. This would have been fine, until the school decided to have only one 4th grade. Jessie is excited about this news, because although she is extremely smart, she isn't good at making friends, and hopes Evan will help her. Evan, however is now afraid and angry that everyone will really see how smart Jessie is and how dumb he is. So here they are now, with a short time before school starts at war, a war that manifests itself through lemonade stands and who can make the most money. Both have their own reasons to want to succeed, but will they go to any measure?