I almost passed this over, based on the solitary negative review. But the "Look Inside" feature persuaded me to take the risk. My first discovery was exceptionally professional writing, and a hook that compelled me to push the button and buy the book. This is indeed the thinking person's spy story. The plot is indeed intricate, and were it a bit less populated with subplots, the story would be smoother. I also found Dillon's strange use of punctuation distracting, but not enough to cause me to lower the rating. His imagery is outstanding. Nick, the protagonist, is a hero not without flaws. But he knows his weaknesses. What starts out as a mole hunt and a search for evidence of a secret Russian project that did not end with the end of the cold war becomes much more personal to Nick when his estranged wife becomes a pawn in the intrique. And there is, of course, a twist at the end. But Dillon scatters enough clues to avoid creating a story with an ending that does not fit. This is not, however, a book for the reader who likes his action figures rough and rugged. Nick is not a one man Seal Team,and he is not Mitch Rapp. But he is a better than average British intelligence operative who does not let the politics that thwart him drag him down. This is a relatively lengthy book and there are a couple of places where it drags, but the crisp dialogue, the distinct characterizations and the sensible division of the chapters brings the reader back on track. I may reread this just to clarify some obscurities in the plot. Overall, I rate this book better than a four and not quite a full fledged five. I will buy other books by this author.