Credit: Natalie Matthews-Ramo. Photos by Thinkstock.

Harriet Downs had it all: a great job, a loving husband, and two beautiful children. She was an up-and-coming programmer at Goldman Sachs for the company’s A.I. trading bots, on the fast track to management. She; her husband, Steve; and the kids had just moved into a beautiful new house in Sevenoaks. Life was good.

Then one day, on the train into London, a man with the lion tattoo on his neck stopped her and showed her a video. The video. She recognized the people on the screen. One of them was her. She remembered the terrible mistake she had made that night. Too much to drink. Too much stress at work. It was never going to happen again. But somehow the man had gotten the video, knew everything about her life, her habits, her family, her work. And he wanted something. It was just a simple piece of code that needed to be inserted into the bots at work. […]

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