Where did you get the idea for your most recent book?
2. I had the idea for the novel, The World Beneath, when I was going down into a subway station in Berlin and was greeted with a blast of air. “Subway tunnels breathe” popped into my head and I knew that was the start of a novel. I was still working on Innocent Blood at the time (book 2 in the Order of the Sanguines series that I write with James Rollins), so I jotted the idea down on my phone. Other the next few months, more notes followed as I realized that the story was about a man, Joe Tesla, who lived in the in-between spaces in people’s lives—the tunnels, the steam tunnels, and Grand Central Station itself. Not by choice, but because he was stricken with agoraphobia and couldn’t leave. But he had means—he was a software millionaire who managed to find a Victorian house built deep underneath New York and moved in there with his service dog, Edison.