In 1968, a man was arrested at Glasgow Airport carrying dynamite in his bag, and within ten days the most feared criminal organisation in Britain had collapsed. But Paul Elvey was no hitman. He was a radio engineer who had spent the mid-sixties keeping a pirate radio station running on a rusting wartime sea fort in the Thames Estuary. The real story is the man who sent him north, a shadowy Canadian financier named Alan Bruce Cooper who was simultaneously embedded with the Kray Twins, registered as an informant with a senior Scotland Yard officer, and reporting to the United States Treasury Department through a handler based in Paris. When Detective Superintendent Nipper Read finally closed the trap, he discovered his own investigation had been operating around a man nobody fully controlled. This is the story of how a botched assassination campaign, three failed murder attempts, and one arrest at a Scottish airport brought down Ronnie and Reggie Kray for good.