The Lemonade War — Jacqueline Davies

For a full hour, he poured lemonade. The world is a thirsty place, he thought as he nearly emptied his fourth pitcher of the day. And I am the Lemonade King.

Evan Treski is people-smart. He is good at talking to people, even grownups. 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. So when their lemonade war begins, there is no telling who will win -- or if their fight will ever end.