Evan Treski

Evan Treski is going into the fourth grade, and having to share a class with his younger sister Jessie who skipped a grade. Evan is upset that he cannot have the teacher he wants, and that he is now going to have to share a classroom with Jessie. For Evan, Jessie has ruined his fourth grade year by being so smart. Evan starts up a lemonade stand with his on-again off-again friend Scott Spencer.

Evan is very good at making friends with people, something that his sister can't do well. He is also a nice person, deep down, and cares for his family. Readers learn that his father has left the family, though readers don't know details. This has to also play into his decisions that occur in the story.

Jessie Treski

Jessie Treski is the younger sister of Evan. She is smart and good with math...