The Murder at the Vicarage: Agatha Christie

"Anyone who murdered Colonel Protheroe,` declared the parson, brandishing a carving knife above a joint of roast beef, `would be doing the world at large a service!`
It was a careless remark for a man of the cloth. And one which was to come back and haunt the clergyman just a few hours later. From seven potential murderers, Miss Marple must seek out the suspect who has both motive and opportunity.