Kerri's book Pick of the Week is "The Double Game" by Dan Fesperman.
The novel was on Adam Woog's best mysteries of 2012 list in The Seattle Times:
As fiendishly clever a spy story as you could hope for. Bill Cage's magazine profile of Edwin Lemaster, a retired spy turned novelist, unwittingly damaged Lemaster's reputation and trashed Cage's own career. Years later, cryptic messages send Cage barreling across Europe, hunting for secrets about his diplomat father, long-buried espionage and Lemaster himself. These messages, based on passages from classic spy novels, are a guaranteed delight for any espionage fan.