Jonathan Stroud said this quote

Lockwood didn’t speak until everything was quiet again. “I know you’re worrying about me, Luce,” he said. “But you really mustn’t. These things happen when you’re an agent. You’ve been snared by ghosts in the past, haven’t you? There was the one that made the bloody footprints, and the thing in the tunnels below the Aickmere Brothers store. But it’s fine, because I helped you then, and you’ve helped me now. We’re there to help each other. If we do that, we’ll get through.” Which was a lovely thing to say, and it made me feel a little warmer. I just had to hope it was true.