Often when books are instructive, authors are a bit too heavy-handed, allowing the lesson to weigh down the story.Such is not the case with The Lemonade War. It's an entertaining introduction to both the mechanics of running a business and to the fact that not everyone sees the world in the same way.Evan's younger sister Jessie is wicked-book-smart. So smart, she's being moved up a grade -- into Evan's class. As much as Evan likes his sister, he's terrified that having her in his class will show up his own poor skills.In the last days before school resumes, Evan's worry leads to arguments with his sister, who doesn't have the people-skills to understand why he's upset. Soon, the siblings are in an all out war. Whoever makes the most money selling lemonade wins. Evan's people-smarts against Jessie's book-smarts.The chapters alternate between Evan's and Jessie's point of view, and the difference between the voices is exceedingly well-done. Occasionally, the same events are described by both kids, and the reader just wants to shake them into reconciliation. By the end of the book, which Davies both wraps up wonderfully and sets up for the sequel, The Lemonade Crime, the reader loves both Evan and Jesse and definitely doesn't want to let them go.This review also appears at Boxes of Paper.