"An assassin is randomly targeting spies in London during the mid-1950s. With no easily discernible motive and contradictory evidence as to who might be controlling him, MI5 call in Gus Benedict, one of their most experienced former intelligence officers, to help unravel the puzzle. What he uncovers is a web of intrigue that seems to point to London’s criminal underworld, with the strings being pulled by a foreign power. Maverick CIA agent Jennifer Marquis joins in the hunt and things head in a direction that no-one could have anticipated."