Talia has just started 6th grade and uses her codebook to figure out the new social rules of middle school. Dash, her best friend, tells her they can’t be friends anymore since other boys are teasing him that she's his girlfriend. Talia hopes that both of them being on the school mathlete team will repair their friendship. But things don't go the way she plans. Using codes, doodles, and puzzles, Talia tries to navigate the pitfalls of middle school and find a way to be a good friend and successful mathlete, all at once.