A Russian defector is found brutally murdered in a London hotel.
Only four people in the world knew he had turned - the four most important and powerful figures in Whitehall. There's only one conclusion -
a mole has infiltrated the highest levels of the nation's security.
Operating in secret from within Westminster's darkest corners, former spy, Solomon Vine, must uncover the traitor. Because Britain's future hangs in the balance. And with it the fate of the whole world . . .