Interesting online 'book'

From Cool Hunting:

"The 21 Steps" is a fast-paced, finely-tuned thriller that uses Google Maps to take the reader through the story's events. Written by British purveyor of spy thrillers, Charles Cumming, the story is told through Google's information bubbles with brief statements and images that take the reader from the streets of London to Edinburgh, Scotland with plenty of action and mini-cliffhangers along the way.

"The 21 Steps" is the first installment of the six-part "We Tell Stories" project by Penguin Books, which takes six contemporary writers and has them write a story based on a classic book. Cumming's classic was The 39 Steps by John Buchan. We spoke to Cumming about "The 21 Steps" and We Tell Stories.

http://www.coolhunting.com/archives/2008/04/charles_cumming.php