Blood Will Out by Walter Kirn. A recommendation from a friend who knows the players (cue spooky music!). From Amazon: "When Kirn first met Clark Rockefeller, he was smitten by the man’s wealth and eccentricities. Coming off a failed marriage (to the daughter of Thomas McGuane and Margot Kidder), Kirn was a bit of a wreck, as was Rockefeller. The two men were drawn to each other. As the friendship progressed--into some uneasy terrain--Kirn ignored the clues 'spread out for [him] to read,' and plowed ahead to become a confidant and enabler. Except, it turns out, Clark wasn’t a Rockefeller at all. Christian Karl Gerhartsreiter was, as Kirn puts it, 'the most prodigious serial imposter in recent history.'"
