The residents of Chipping Cleghorn are astonished to read an advert in the local newspaper that a murder will take place this coming Friday at Little Paddocks, the home of Letitia Blacklock. Unable to resist, the group gather at the house at the appointed time, when the lights go out and a gun is fired. Enter Miss Marple, who must unravel a complex series of relationships and events to solve the mystery of the killer...