In north Africa, young SAS trooper Danny Black is coming to the end of a gruelling tour of duty, or so he thinks. An MI6 agent needs to make contact with Syrian rebel forces, and also with the private military contractors who are - unofficially - training this rebel faction. Danny finds himself sucked into the murky orbit of the private military, a world where individuals will betray anybody if the price is right. And where a secret lurks that will change the course of Danny"s own life, however long that might last.