A brother and sister start a competition to see who can make the most money running a lemonade stand. Evan is extroverted and popular. He loves to talk to people, and is great at getting customers to stop and buy lemonade. But Jessie is a math genius, and she knows how to organize the business for optimal sales. They are both determined to win and prove that they are the best, but underneath they just want to repair their relationship.

There are a lot of misunderstandings between Evan and Jessie and they overreact and get angry, resulting in the war. I love how complex their personalities are, and we get to see some great character development with both of them. As the eldest of four siblings, I love stories about siblings. This story perfectly captures that weird balance that siblings have between love and complete annoyance. Nobody can drive you crazy like your siblings, and nobody can heal your hurts and teaching you about yourself and your role in the world like siblings.

The plot is really engaging with many twists and turns as Evan and Jessie try new methods for making more money from lemonade. But the center of the plot is their growing animosity toward each other and finally their reconciliation.

I like the way that the writing switches between the siblings' POVs, and we get to see some of the same scenes from their different perspectives. It was really interesting to be inside their heads as they plot and scheme against each other.

Such a fun book!