Joris Luyendijk, an investigative journalist, knew as much about banking as the average person: almost nothing. Bankers, he thought, were ruthless, competitive, bonus-obsessed sharks, irrelevant to his life. And then he was assigned to investigate the financial sector. Joris immersed himself in the City for a few years, speaking to over 200 people - from the competitive investment bankers and elite hedge-fund managers to downtrodden back-office staff,...