Double agents and threats of double agents abound in this novel as the two spy chiefs from M16 and King David Blvd figure out how to flush them out. Besides the thrilling plot, I like reading about the many different places that Silva puts his characters - quite a few in each novel, actually. Silva has a unique idea in this novel. Could Kim Philby's children have become spies like himself? Silva throws in current events and his take on them to make the plot seem it could happen. A long story that kept my interest to the end.