Mason, unable to cope with the loss of his family is forced to resign from the SAS.
With his life over, he is enticed into the cut throat security industry in Iraq by an old comrade who forces him into a suicidal mission. His team is attacked and two of his men are taken hostage. Mason escapes with the help of a mysterious Arab cult, who are custodians of an ancient secret kept deep within the Basrah Marshes. Blamed and discredited, he races against time to free his men, unaware that his journey to Damascus and down the great Euphrates, echoes in the footsteps of the secret and its guardian a Crusading knight. The torment of the two warriors unfolds their destinies entwined, as each searches for redemption.