Introducing Luke Carlton - ex-Special Boat Service commando and now under contract to MI6 for some of its most dangerous missions. Sent into the steaming Colombian jungle to investigate the murder of a British intelligence officer, Luke finds himself caught up in the coils of a plot that has terrifying international dimensions.

To those who don’t really know her, Kate Henderson’s life must seem perfectly ordinary. But she is in fact a senior MI6 officer, who right now is nursing the political equivalent of a nuclear bomb. Kate’s most recent mission has yielded the startling intelligence that the British Prime Minister has cancer - and that one of the leading candidates to replace him may be a Russian agent of influence. Up against the clock to uncover the Russian mole, Kate risks everything to get to the truth.

As senior MI6 Officer Kate Henderson arrives for a weekend away in Venice, a Russian spy enters the city with plans to kidnap her. But it’s not all it seems. The defector offers her conclusive evidence that the British prime minister is a live agent working for Moscow. Kate’s holiday quickly becomes the start of her next mission. With proof of the PM involved in a sordid scandal and a financial paper trail that undeniably links him to the Russians, the evidence seems bulletproof. But is anything in the dark world of espionage ever that simple?

Attempting to rebuild her shattered life in the South of France, former MI6 operative Kate Henderson receives an unexpected and most unwelcome visit from an old adversary: the UK prime minister. He has an extraordinary story to tell - and he needs her help. A Russian agent has come forward with news that the PM has been the victim of the greatest misinformation play in the history of MI6. It's run out of a special KGB unit that exists for one purpose alone: to process the intelligence from 'Agent Dante', a mole right at the heart of MI6 in London.

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.