"Last Days of Summer" is the story of Joey Margolis, neighborhood punching bag, growing up goofy and mostly fatherless in Brooklyn in the early 1940s. A boy looking for a hero, Joey decides to latch on to Charlie Banks, the all-star third baseman for the New York Giants. But Joey's chosen champion doesn't exactly welcome the extreme attention of a persistent young fan with an overactive imagination. Then again, this strange, needy kid might be exactly what Banks needs.