This is an Assassin’s Creed Revelations Walkthrough "Introduction" that tells the story so far.

For the complete Assassin’s Creed Revelations Walkthrough with lots of tips and video guides, please visit:
http://www.videogamesblogger.com/2011/11/15/assassins-creed-revelations-walkthrough-video-guide-xbox-360-ps3-pc.htm