Arthur Opp weights 550 pounds and hasn't left his Brooklyn Brownstone in many years. Kel Keller lives 20 miles north on the Hudson and is the poor kid in the rich school dreaming about a future as a professional baseball player. They are connected by Kel's mother, a former student of Arthur's. There are a lot of sad stories in this engaging novel, but it is not a sad book. Liz Moore adeptly spins the tale of the commonalities that bring disparate people together (and includes a serious dose of addiciton to keep it from getting too light).