"The Double Game" by Dan Fesperman is a great read, the most enjoyable espionage novel I've read in years. It's also a veritable homage to spy fiction from decades past, with lines from earlier novels providing clues and plot points to the unfolding mystery. Terrific dialogue, characters, and suspense. Knopf publisher Sonny Mehta’s letter on the back cover of the galley is the truth: “For anyone who loves a good spy thriller–and who has loved them for years–this will be a treat.”

Update: I finished reading "The Double Game" and the second half of the novel really paid off. It was terrific all the way through, with many surprises along the way and a satisfying ending. I highly recommend this book by Dan Fesperman, and now want to read more of his work.