For Bobby Marks, summer does not equal fun. While most people are happy to take off their heavy jackets and long pants, Bobby can't even button his jeans or reach over his belly to touch his toes. Spending the summer at Rumson Lake is sheer torture. This particular summer promises to be worse than usual. His parents can't stop fighting. His best friend, Joanie, goes home to New York City and won't tell him why. Dr. Kahn, a rich, stingy estate owner who hires him to manage an enormous lawn, is working him to death. And to top it off, a local bully won't stop torturing him. Bobby is about to find out just how terrifying and exhilarating one fat summer can be.