Marple: A Murder Is Announced (2005)

The residents of Chipping Cleghorn are astonished to read an advert in the local newspaper that a murder will take place the following Friday at 7:30 p.m. at Little Paddocks, the home of Letitia Blacklock. A group gathers and at that precise moment, the lights go out and a young hotel employee, Rudi Schertz, is shot. The police assume he had placed the ad and planned it as a robbery, but for Miss Marple it's not that obvious. She believes that the killer was likely one of the people in the room. When two of those present the evening of the murder are subsequently killed, it is left to Miss Marple to unravel a complex series of relationships and false identities, all centered around Randall Goedler a wealthy industrialist who had died 10 years earlier.