My opinions on this book are based solely on the book's writing style and plot. I don't know the accuracy of the claims in the book and I find them irrelevant in that I consider this book a work of fiction meant solely to entertain. The author only mentions that the societies mentioned in the book (the Priory of Scion and Opus Dei) are real societies.The Da Vinci Code is a thrilling roller-coaster ride of events that surprise the reader at every corner. Brown often ends his chapters on a suspenseful note which leaves the reader anxious to read on. He starts off the novel with the murder of Jacques Sauniere, a prominent man working at the Louvre. The plot continues as Sauniere leaves a message for his granddaughter Sophie Neveu and Harvard professor Robert Langdon at the scene of his death. Neveu and Langdon are sent on a sort of treasure hunt (where symbols and clues are everywhere they turn) to learn why Sauniere and others have been killed and to find the Holy Grail.I find that the plot is excellent in terms of its riveting sequence of events. I found myself involved, trying to figure out the clues along with the characters. Some of the things Neveu and Langdon find are very controversial. But, they don't shatter any beliefs I had before. If anything, the claims about the church and about Jesus make me want to investigate the issues for myself.For readers who can get past the controversial nature of the book, this is a suspenseful page-turner that keeps you hanging every step of the way. 

Question: How is the plot?
Answer: the plot is excellent in terms of its riveting sequence of events