It is 1274 & in the fortified city of Acre the last major stronghold of the Crusaders in Palestine an epic conflict is beginning. Will Campbell is a Templar Knight trained for war but as a member of the mysterious group known as the Brethren he is also a man of peace. After years of bloodshed the Brethren have helped to create a truce between the Christians & Muslims. But Will now fears they have been betrayed. King Edward of England has promised the Pope that he will lead a new Crusade while in Acre itself a ruthless cabal of Western merchants profiteering from slaves & armaments is plotting to reignite hostilities in the Holy L&. Meanwhile in Egypt Sultan Baybars is caught in a power struggle. His son & heir has become involved in the dangerous designs of the insidious soothsayer Khadir. While Baybars wants to take on the mighty Mongol empire Khadir & others want to destroy the Christians once & for all. As war looms Will is torn between his oath as a Templar his secret role in the Brethren & his duty to Elwen the woman he loves but is forbidden to marry. He is caught at the centre of a web of deception & destruction as he & all those around him rush headlong towards one of the most dramatic moments in history.