He tried to think how many men he had killed and could not remember. "How many do you need to kill before you lose count?" he wondered. Sir Stephen Mendal, head of MI6, looked up from the report. Apparently an unknown secret organization had been recruiting ex-MI6 agents, specifically those that specialized in "wet work", the nasty side of the business. One of these old employees had just been shot dead by the authorities whilst robbing a bank in Switzerland. He had to know more. What was this organization up to, and why employ such specialists? He decided he needed a spy.

In the fog of war, when friends can appear as enemies and enemies as friends, only one thing is certain—when in doubt, there is no doubt.

When an MI6 agent is found to be keeping records of his missions to protect himself from betrayal he unwittingly makes himself a priority target. But how do you silence the most dangerous man imaginable? Send him into hell on earth. While Alex King is sent into Northern Iraq to tidy the loose ends of a botched mission, the archipelago of Indonesia is under communist threat from within its own military. A consortium of worried businessmen call for desperate measures and seek the services of an assassin.

Court Gentry is known as The Gray Man—a legend in the covert realm, moving silently from job to job, accomplishing the impossible, and then fading away. And he always hits his target. But there are forces more lethal than Gentry in the world. And in their eyes, Gentry has just outlived his usefulness. Now, he is going to prove that for him, there's no gray area between killing for a living-and killing to stay alive.

989 AD. Alfred the Great’s dream of a united England has been forged by his daughter Aethelfaed and grandson, King Aethelstan. The Vikings have been expelled from York following the death of Erik Bloodaxe, and for two generations there has been peace between Saxon and Dane. A new Viking warlord Olaf Tryggvason seeks revenge for Bloodaxe's death and the slaughter that followed, and has set his sights on a fresh assault on England’s shores. With Skarde Wartooth they set sail for Saxon lands, hungry for glory, conquest and vengeance.