Fifteen-year-old Felton Reinstein has always been on the smallish side, but in his sophomore year he starts growing…and growing.

During gym one day he smokes the football jocks in a 600-yard race. Felton has never been interested in sports, but there’s no doubt—he is “stupid fast.” As he juggles his newfound athletic prowess, his mom’s sudden depression, an annoying little brother, and his first love, he discovers a shocking secret about his past which explains why he’s turning out the way he is.