Just a man talking about his life. The first part of the book is like having your father or uncle sitting in your living room talking about his life. It's not a comedy, but he might occasionally say something that strikes you funny. We learn more about growing up in an obscure province of the Roman Empire than we ever have before.
The middle of the book is devoted to Jesus' personal observation of his ministry as provided in the Gospels. Here we see yet again the wonderful teachings that have survived the centuries.
The last part of the book deals with the Passion and gives it a sense of personal immediacy that we have never encountered before. Jesus' life is contained in history and yet contains it.