Constantinople 1204- the holy city is raised to the ground by Crusaders - the roads awash with blood. Modern-day Istanbul- an elite group of archaeologists uncover the grave of Enrico Dandolo, once Doge of Venice, and leader of the bloodthirsty Fourth Crusade. They seek a legendary document that reveals the truth behind the Doge's rumoured secret links to the Templar knights. Days later the team vanishes without a trace. All that remains in the ransacked grave is a strange key inscribed with an ancient code. Special Operatives Max Boland and Laura Graves are called in. They soon find themselves battling against an ancient enemy in a life-or-death race against time. The dark secret of Dandolo's tomb - and his mysterious link to the Templar knights - is about to be revealed.