Writer Walter Kirn found himself part of a real-life plot twist when he realized that one of his longtime friends was playing him, and everyone else, as part of an elaborate con. In "Blood Will Out: The True Story of A Murder, A Mystery and A Masquerade,"Kirn tells the chilling story of his friendship with Christian Gerhartsreiter, aka Clark Rockefeller, who duped Kirn for years by pretending to be part of the Rockefeller dynasty. Gerhartsreiter was eventually arrested by the FBI in Baltimore and tried for murder.