After fainting during a school assembly, Stanley uses his time in a safe room to begin drawing a comic book superhero and then enters a treasure hunt so that he can win passes to Comic Fest.

Eleven-year-old June is determined to beat her anxiety and become the lion she knows she is, instead of the mouse everyone sees, and with the help of Homer Juarez, the poetry-reciting soccer star, she starts a secret library garden and hatches a plan to make her dreams come true.

Twelve-year-old Marvel is afraid of absolutely everything -- amusement park rides, food poisoning, earthquakes, and that big island of plastic floating through the ocean. She also obsesses about smaller worries like making friends, getting called on by the teacher, and walking home alone. Her parents and the school therapist call her worries an anxiety disorder, but Marvel calls them armor. If something can happen, it will. She needs to be prepared....