Who is Navinder Singh Sarao? Depending on whom you ask, Sarao is a scourge, a symbol of a financial system run amok, or an outsider who took on the tyranny of the big-timers. In 2010, this reclusive trading prodigy manipulated Wall Street and amassed millions from his childhood bedroom—then short-circuited the global market. Examining this half-hour market meltdown, Oliver Bullough gives panoramic insight into our economic landscape, and profiles the man at the heart of the crash.