Easy to Kill by Agatha Christie

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!