What is the book playing for pizza about?

Playing for Pizza: How I Went from Dorms to NFL Europe's Rhein Fire: One Fan's Crazy Football Adventure is a first-person memoir by John Grisham about his experience with American football during a single 1994 season in the NFL Europe semi-professional league playing for the Rhein Fire and their home base of Mönchengladbach, North Rhine-Westphalia/Germany