An expert in alternative medicine is creating a clinic in Cranbury Hall that promises to cure fatigue, and Arnold Gilroy is happy to invest in this promising moneymaking venture. Unfortunately, his half-brother Oliver has just finished a stint in prison for fraud - and has weaseled his way into running Cranbury Hall while pursuing some nefarious business on the side. Before long, Oliver’s been grazed by a bullet - and Dr. Lancelot Priestley will have to step in before the killer strikes again, with more success this time, in this Golden Age British mystery.