Ian Fleming called his secret agent James Bond because the name was dull. But there is nothing dull about Robin Wigglesworth's history of the bond market's relentless innovation toward efficiency, liquidity (and crashes) from the Middle Ages to the present. Wigglesworth, the editor of the Financial Times's witty Alphaville column, offers essential insight into the gargantuan market in U.S. Treasury securities that underpins world finance—and the hazards of increasing leverage.