Charles Cullen is by some estimates the most prolific serial killer in American history. But when Krysty Wilson-Cairns began writing the script about his capture, she started not with Cullen, who was sentenced to consecutive life sentences in 2006, but outside the home of Amy Loughren, the nurse who first uncovered his crimes.
“I turned up at the real Amy’s house in upstate New York,” Wilson-Cairns, the Scottish screenwriter, recalls. “I think I was 23 or 24. I was like: ‘I’ve never done this before. It’s really important to me. It’s your life story. Can you help me?’”
