Mainstream is to produce a spin-off guide to Dan Brown’s new book within days of its publication.

Decoding The Lost Symbol by Simon Cox will be published “approximately two weeks” after Dan Brown’s novel, The Lost Symbol, appears on 15th September, even though the content of the latest Brown offering remains almost entirely under wraps.

Cox’s guide to The Da Vinci Code, Cracking The Da Vinci Code, has sold nearly 60,000 copies through Nielsen BookScan since publication in April 2004.

Here are the 10 best selling fiction and non-fiction books for this week from Amazon.ca. Bracketed figures indicate position the previous week:

FICTION

1 (-) The Lost Symbol – Dan Brown (hardcover)

2 (1) The Twilight Saga Collection – Stephenie Meyer (hardcover)

3 (3) The Cellist of Sarajevo – Steven Galloway (paperback)

4 (2) The Book of Negroes – Lawrence Hill (paperback)

5 (5) The Shack – William Young (paperback)

Da Vinci Code author Dan Brown will be releasing a new book this fall, four months after the theatrical release of “Angels & Demons,” the film adaptation of his first bestseller.

The Last Symbol will have a first printing of five million copies and will once again feature Brown’s trademark protagonist, Robert Langdon, according to a recent announcement by Sonny Mehta, chairman and editor in chief of the Knopf Doubleday Publishing Group.

Doubleday, which will be publishing the novel in the United States and Canada, is an imprint of Knopf Doubleday Publishing Group.