Detective Sergeant Kathleen Doyle was investigating a tip she'd received about doctors who were being assaulted at a London free clinic, but-strangely enough-none of the volunteers was willing to give her a statement. Instead, her only witness offered a fanciful tale about supernatural evildoers-which was nonsense, of course; it was clearly an attempt to shift the blame to the appropriate cultural bogeyman. Although it did seem as though there were...