In 2001, long before Bernard Madoff burst into the spotlight with his massive Ponzi scheme, Erin Arvedlund wrote an exposé for Barron's questioning Madoff's claimed investment returns. When Arvedlund, then a staff writer for the magazine, pressed Madoff on how he did it, he replied: "It's a proprietary strategy. I can't go into it in great detail." Well, sorry, Bernie -- Arvedlund now has the details. Her book about Madoff, Too Good To Be True, will be published Aug. 11 by Portfolio, a division of Penguin Group (USA). In the exclusive excerpts that follow, she explains the key roles played by Madoff's London office,...