"You'll face two charges," I said. "One for murder and one for extortion." Ludovic Travers remembered Brian Jedmont as a photographer whose ambition outran his sense of ethics. The Broad Street Detective Agency had stopped using his services in unfortunate circumstances, and Travers was accordingly surprised when one day Jedmont turned up at the office anxious to become a client on his own account. Specifically, he wanted Travers to investigate...