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Dan Brown's latest book Inferno is due out on the 14th of May, 2013. And as is usual with Mr. Brown, he can't resist having a bit of fun by hiding secrets and codes about the place for those willing enough to seek them out (such as the very intelligent visitors and commenters on this website), well in advance of the book's release. As you can see from the video above, one of those appears to be that the publication date of the book (5.14.13) was chosen for a very specific reason: when flipped/read right to left it gives the first five digits of pi (3.1415).
To learn more about the mysteries, history and locations that Dan Brown will likely be exploring in Inferno, be sure to download a copy of Inside Dan Brown's Inferno from the Kindle store (just $2.99!). Using some of these hidden clues that Dan Brown has left about 'for those with eyes to see', the book is an excellent primer that fills you in on the background information behind Inferno to allow you to enjoy the book to its fullest.
Click on the cover below to go get a copy: