This is a standalone story that can be read without reference to any other novel but it includes the main characters from "The Assassin, The Grey Man and The Surgeon" and "To Kill A Grey Man" by D C Stansfield.

"I need to speak with The Grey Man, " said Gregov and watched the effect it had on the elegant man in front of him."
"I don't know who you are talking about, " he blustered.
"The man who runs your bloody secret service and has done since before my time. I have something he will want."
"You are bluffing, " said Sir Evelyn but did not call his dogs forward. "What do you have?"
Gregov took a deep breath, "London is going to be destroyed by a weapon of mass destruction."
"How do you know?"
"Because, " said Gregov. "I sold the weapon."
So starts the race to save London, led by an SAS major dishonourably discharged from the army, a young man still at university and three old men, an assassin, an intelligence expert and a breaker of men. If they fail, the world as we know it will cease to exist.