Retired police officer Luke Fitzwilliam traveled by train to London. On the way he chatted with his fellow passenger—an elderly lady with the surname Pinkerton—and it turned out she was going to Scotland Yard to report a series of murders committed in her town of Wichwood-under-Ash. Deep down, Luke laughed at the impressionable provincial girl and didn’t believe a single word she said. However, he had to change his mind soon enough when, a little later, he learned that Miss Pinkerton had been hit by a car. And Luke went to Wichwood to investigate that case. But it’s unlikely he could have handled such a difficult task without Superintendent Battle joining the investigation…