Dr. Gretchen White, who held advanced degrees in psychology, statistics, and criminology, had been tapped by Shaughnessy more than a decade ago to consult on a case where the suspect had reminded him of Gretchen. After that first successful investigation together, Shaughnessy had kept calling, slowly at first but then more often. And then other detectives had followed suit, until Gretchen was well known—though not always well liked—at Boston PD headquarters.
