On her way to Scotland Yard to report a series of murders, an old woman is knocked down by a hit-and-run driver…

Luke Fitzwilliam could not believe Miss Pinkerton’s wild allegation that a multiple murderer was at work in the quiet English village of Wychwood – or her speculation that the local doctor was next in line.

But within hours, Miss Pinkerton had been killed in a hit-and-run car accident. Mere coincidence? Luke was inclined to think so – until he read in The Times of the unexpected demise of Dr Humbleby…