Evan Treski is people-smart. He is good at talking with people, even grownups. His younger sister, Jessie, on the other hand, is math-smartbut not especially good at understanding people. She knows that feelings are her weakest subject. So when their lemonade war begins, there really is no telling who will winand even more important, if their fight will ever end.

Here is a clever blend of humor and math fun. As it captures the one-of-a-kind bond between brother and sister, this poignant novel subtly explores how arguments can escalate beyond anyones intent.