"Through use of public cameras, tracking social media, text messages, e-mails," he explains. "The public would consider it a huge invasion of privacy, but the government wanted to pay Harold good money to have a system to track and predict terrorist attacks. It sorted the violent crimes into two categories; relevant, meaning large scale attacks that would take dozens of lives, and irrelevant. Violence that would only affect a few people."

John shakes his head and says, "Harold's partner wasn't happy with that. I never knew him, but I think I would have liked him. He built a back door into the system, a way to have the irrelevant numbers fed to him before they were wiped every night. Nathan was killed in a bombing, though, the same one that injured Harold, the one that caused his limp. He felt guilty, I think, and he took up the work Nathan was doing, but he needed help. That's where I came in."