Gillian Tett [is the author of] Fool's Gold: How the Bold Dream of a Small Tribe at J.P. Morgan Was Corrupted by Wall Street Greed and Unleashed a Catastrophe. Tett is a respected business journalist at the Financial Times. Tett successfully pieces together the colorful backstory of the bank's work to win acceptance in the market for its brainchild, turning credit derivatives "from a cottage industry into a mass-production business." With the benefit of hindsight, we know that while these inventions were intended to control risk, they amplified it instead. This novel idea turned noxious when applied broadly to residential mortgages, a game that the rest of Wall Street later entered into with gusto. We learn in deep detail about not only how collateralized debt obligations are assembled but also their many iterations. Perhaps it's noteworthy that Tett's book begins when JPMorgan had the face-value equivalent of $1.7 trillion in derivatives on its books. Today that number has jumped to a mind-boggling $87 trillion. Part of that portfolio includes almost $8.4 trillion in credit derivatives, more than Bank of America's (BAC), Citi's, and Goldman Sachs' (GS) holdings combined.