MixedAir MailVogel’s account has its merits: it’s deeply researched...doggedly comprehensive (albeit at times the narrative is more exhausting than exhaustive as Vogel keeps spinning out the tale); and he consistently strives to put some flesh on the bones of his large cast of characters ... At its most successful, the narrative is spun like a double helix—the life of George Blake, the double agent who disclosed the elaborately covert plan...to his Soviet spymasters before the first shovel had even been struck into the ground, is nicely intertwined with the earnestly detailed account of the tunneling mission ... Yet, by the book’s end, I couldn’t help but wonder what Betrayal in Berlin added to the already large library on the tunnel and the curious life of George Blake.