With help from her trusty notebook, Talia thinks she has cracked the codes of middle school--what to wear, what to say, what not to say. But knowledge and mastery don't always equate, and codes are like homework: just when you think you're caught up, a new batch arrives. Luckily math brims with codes, and Talia, with her knack for observations and deductions, understands math. As part of a newly merged coed math team, Talia must navigate not only her own struggles with competition, leadership, and stage fright, but also the girl-boy codes and her jealousy of the team's "perfect" new captain. Being on the same team, it turns out, doesn't always mean you're friends, but it does give you the space to try. Second in a charming spin-off series from the creator of the phenomenally popular Amelia books, this doodle-dense, STEM-centric diary will delight and engross readers navigating unfamiliar social terrain.