It focuses primarily on Tom Brady and his personality, values, and demeanor. It gives extensive detail about his Catholic upbringing, his relationship with his father, mother, and sisters, and the role football and baseball played in his youth.
It is low on details of football; the author apparently decided to write the book based on the 2005 season, which was when they were coming off of two straight super bowl wins and struggled throughout the season before losing to Denver in the playoffs.
It doesn't discuss much except focus on his relationships with different mentors and personalities.
Don't read it unless you and deeply interested in his personality and relationships.