The thrilling novel of espionage and murder set in the dark heart of Westminster, from the UK's most exciting new spy writer

A Russian defector is found brutally murdered in a London hotel.

Only four people 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, S ...