The first book in the beloved Lemonade War series - a clever blend of humor, math wizardry, and business know-how - has sold more than 1.5 million copies and is now available as a full-color graphic novel! Evan Treski is people smart. He's good at talking to people, even grown-ups. His younger sister, Jessie, on the other hand, is math smart - but not especially good at understanding people. She knows that feelings are her weakest subject. With just five days left of summer vacation, Evan and Jessie launch an all-out war to see who can sell the most lemonade before school starts. As the battleground heats up, there really is no telling who will win - and, even more important, if their fight will ever end.