Sibling rivalry turns into a business battle in The Lemonade War series, a smart and engaging collection for readers ages 8–12. Evan and Jessie Treski are brother and sister—one outgoing, one academically gifted—and their differences spark a summer-long competition to see who can sell the most lemonade. But as the series unfolds, their adventures grow beyond lemonade stands into mysteries, school politics, and family challenges.