Cracking Da Vinci's Code: You've Read The Fiction Now Read the Facts
By: James L. Garlow & Peter Jones
Breaking the Da Vinci Code: Answers to the Questions Everybody's Asking
By: Darrell L. Bock, Ph.D.
The Gospel Code: Novel Claims About Jesus, Mary Magdalene and Da Vinci
By: Ben Witherington III
Books the Church Suppressed: The Fiction and Truth in The Da Vinci Code
By: Michael Green
The Gnostic Empire Strikes Back: An Old Heresy for the New Age
By: Peter Jones
The Real History Behind the DaVinci Code
By: Sharan Newman
The Da Vinci Hoax: Exposing the Errors in The DaVinci Code
By: Carl E. Olson & Sandra Miesel
Solving the DaVinci Code Mystery
By: Bradon Gilvin
The Da Vinci Code: Fact or Fiction
By: Hank Hanegraaff & Paul L. Maier
The Da Vinci Deception: Credible Answers to the Questions Millions are Asking about Jesus, The Bible, and the Da Vinci Code
By: Erwin W. Lutzer
These books do document their research (unlike Brown) and show you where Brown got his ideas. I really like the book by Garlow and Jones. I used it for research for a couple of lessons I did on The DaVinci Code during a series of lessons on the development of the New Testament as Canon. I also consulted the book by Bock. I would read anything by Ben Witherington and Michael Green. The one really interesting book is The Gnostic Empire Strikes Back by Peter Jones. I bet that it will be a treat to compare the true gnostic doctrine to Brown's version of it. For those interested in seeing just how falacious Brown's novel is, any of these books will due. I hope these books will help any of you struggling with Brown's theory.