"I can't give away details of an active investigation like that," he says gently, but he looks uncomfortable nonetheless. Like he wishes he could help her. "If you can think of a more precise date, though, that would help."

He hesitates uneasily, trying to work out how to negotiate the conversation.

"We will be pulling footage from traffic cameras too, so, if there's one near your friends house that will help."

Although, equally, if there's one near Norrell's then it might not.