Can you imagine a headline reading: "Jesus Seminar leads Evangelical to the Catholic Church." ?
Probably not, but in this case, that is exactly what happened. Shea writes about his attempts to counter the claims of the Jesus Seminar through his Evangelical faith and his eventual discovery that the Evangelical faith is not capable of the task because of the belief in sola scriptura.
Shea found that it is only by accepting the possibility of an authoritative Tradition as found in the Catholic Church that it is possible to even use the Bible as an authoritative source because without Tradition the Bible is just a book with a disputed number of chapters with a disputed interpretation.
This book is very easy to read but still holds the depth necessary to avoid glossing over some very important and difficult points. The reader will find plenty of scripture quoting and several examples of what the Evangelicals believe about tradition and what they refuse to admit.
Shea writes a refreshing conversion story which focuses on the Catholic notion of Tradition far more than most others. It is a very important topic to discuss since this is one of the primary differences between Catholics and Protestants.