Clay Knight began his digital career by hacking into Deutsche Bank. Then Citi. Bank of America didn’t present too much trouble. Knight was one of the good guys: a double agent employed by the banks to penetrate the hacking community and work out the banks’ weaknesses. The anti-hacking software he helped develop was sold for $67 million: though after the venture capitalists got their money back, Knight only received enough to start up some small ventures of his own. He moved to a company that creates cutting-edge digital startups: always exploring, always hunting for that elusive “next big Internet thing.” But while the Facebooks and LinkedIns went mega, he could only look on.