Plot

Miss Jane Marple comes to solve the mystery when a local woman is poisoned, but a visiting movie star seems to have been the intended victim.

In 1953, the small English village of St. Mary Mead, home to Miss Jane Marple (Dame Angela Lansbury), is delighted when a big American movie company arrives to make a movie telling of the relationship between Jane Grey and Elizabeth I, starring famous actresses Marina Rudd (Dame Elizabeth Taylor) and Lola Brewster (Kim Novak). Marina arrives with her husband Jason (Rock Hudson), and when she discovers that Lola is will be in the movie with her, she hits the roof, as Lola and Marina loathe each other on sight. Marina has been getting death threats, and at a party at the manor house, Heather Babcock (Maureen Bennett), after boring Marina with a long story, drinks a cocktail made for Marina, and dies from poisoning. Everybody believes that Marina is the target, but the Police Officer investigating the case, Chief Inspector Dermot Craddock (Edward Fox) isn't sure, so he asks Miss Jane Marple, his aunt, to investigate.—Lee Horton <Leeh@tcp.co.uk>

An American company arrives in Miss Jane Marple's (Dame Angela Lansbury) small hometown to make a movie. Among the cast is famous actress Marina Rudd (Dame Elizabeth Taylor). At a function to celebrate commencement of the movie, young townswoman Heather Babcock (Maureen Bennett), dies from being poisoned. It appears that the intended victim was Marina Rudd. Miss Jane Marple and her nephew, Chief Inspector Dermot Craddock (Edward Fox) of Scotland Yard, investigate.—grantss

St. Mary Mead is all aflutter when movie star Marina Rudd (Dame Elizabeth Taylor) and a movie crew arrive is St. Mary Mead to film Mary, Queen of Scots with Marina in the lead role. At a reception, however, the secretary of the village organizing committee, Heather Babcock (Maureen Bennett), dies from a poisoned cocktail. The drink was Marina's, who had given it to Heather after she spilled her first one. There is already considerable tension between many of the characters, so there are many possible suspects. Jason Rudd (Rock Hudson), Marina's husband and the director of the movie, is having an affair with Production Assistant Ella Zielinsky (Geraldine Chaplin). Lola Brewster (Kim Novak)--Marina's hated rival and friend of Producer Martin N. Fenn (Tony Curtis)--arrives, having been given a small part in the movie. Miss Jane Marple (Dame Angela Lansbury) and her nephew, Scotland Yard Chief Inspector Dermot Craddock (Edward Fox), work together to solve the puzzle.—garykmcd

Set in the fictional English village of St. Mary Mead, home of Miss Jane Marple (Angela Lansbury), in 1953. The movie opens with a black-and-white scene from a movie being played at the local community house titled 'Meeting at Midnight' where a detective in the movie assembles a group of people together at a quait country mansion to root out them for the murder of the wealthy owner. The film breaks which depresses the local audience, until Miss Marple reveals, according to her natural skill of observation, who the murderer in the movie is.

Meanwhile, a big Hollywood production company arrives to film a costume movie about Mary, Queen of Scots and Elizabeth I with two famous movie stars, Marina Rudd (Elizabeth Taylor) and Lola Brewster (Kim Novak). Marina and Lola are old rivals who hate each other. Marina, who is making a much heralded comeback after a prolonged "illness" and retirement, when she, in reality, has had a nervous breakdown, and her husband, Jason Rudd (Rock Hudson), who is directing the movie they are making, arrive with their entourage. When she learns that Lola will be in the movie as well, she becomes enraged and vents her anger.

Lola and her husband, Martin N. "Marty" Fenn (Tony Curtis), who is producing the movie they are making, then arrive at the gathering. Excitement runs high in St. Mary Mead, as the locals have been invited to a reception held by the movie company in a manor house, Gossington Hall, to meet the celebrities. Lola and Marina come face to face at the reception and exchange some potent and comical insults, nasty one-liners, as they smile and pose for the cameras. The two square off in a series of hilarious and cleverly written and performed cat-fights throughout the movie.

After her initial exchange with Lola at the reception, she is cornered by a gushing, devoted fan, Heather Babcock (Maureen Bennett), who bores her with a long and detailed story about having actually met Marina in person during World War II. After recounting the meeting they had all those years ago, when she arose from her sickbed to go and meet the glamorous star, Babcock drinks a cocktail that was made for Marina and quickly dies from poisoning. The incident is unfortunate for Marina's mental state, and she is beside herself. Everyone is certain Heather was the intended murder victim. Once filming begins on the movie, Marina discovers that apart from threatening notes made up of newspaper clippings, her cup of coffee on the set has also been spiked with poison, sending her into fits of terror.

A police detective from Scotland Yard arrives to investigate the case. Inspector Dermot Craddock (Bernard Fox) is baffled as he tries to uncover who is behind the attempt on the life of the actress and the subsequent murder of the innocent woman. The suspected are Ella Zielinsky (Geraldine Chaplin), Jason's production assistant who is secretly having an affair with him and would like Marina out of the way, and the hot-headed actress Lola Brewster. Inspector Craddock even suspects Marty Fenn may have have something to do with the attempt on Marina's life since he is Lola's blindly loyal husband.

Inspector Craddock then meets with Marina who tells him about reciving the death threats against her in the form of two notes delivered recently and claims not to know who is behind them. When Inspector Craddock questions Jason about the notes, he clearly acts somewhat suprised as if hearing about it for the first time, and he calmly tells the inspector that he wanted to keep the threats on his wife a secret as not to bring on bad publicity for the Hollywood studio.

Inspector Craddock asks his aunt, the renowned amateur detective Miss Jane Marple, who injured her foot at the reception and is confined to her home, for assistance. The main suspect, Ella Zielinsky, is later killed by a lethal nose spray after going to a pay phone in the village, where she called the murderer and threatened to expose them.

At the climax, Miss Marple, now back on her feet, visits Gossington Hall, where Marina and Jason are staying, and views where Heather Babcock's death occurred. Working from information received from her cleaning woman, Cherry Baker (Wendy Morgan), who was working as a waitress the day of the murder, the determined elderly sleuth begins to piece together the events of the fatal reception and solves the mystery: Marina herself is the murderer.

In the film's denouement, Miss Marple explains to Jason Rudd and Inspector Craddock about the two murders that have occurred. Heather Babcock's story was Marina's initial motive. Ten years earlier, Miss Babcock suffered from German measles; a rather harmless disease to most adults, but problematic for a pregnant woman. Heather Babcock innocently infected Marina when she met her during World War II during a stage performance. Marina was about a month pregnant at the time; the disease caused her child to be born with mental retardation. Upon hearing the unknowing Heather cheerfully tell this story, Marina was overcome with rage and poisoned Heather without thinking. She then spread the idea that she was the intended victim in order to throw off suspicion from herself, delivering death threats and poisoning her own coffee at the studio. Ella, who made phone calls to various suspects from the town's pay phone, accidentally guessed correctly, apparently prompting Marina to murder her as well. Miss Marple also deducts that Jason Rudd knew about Marina's murderous secret after Inspector Craddock told him the other day about the death threat notes that Marina received. Jason saw right through the charade as he realized that Marina fabricated everything because she never told him about the death threat notes, and thus decided to protect her.

Jason, Marina's devoted husband, confesses to Miss Marple that he actually administered a dosage of poison just last night to save her from prosecution. However, when they enter Marina's room, they see that Marina is now dead. However, Marina didn't touch the hot chocolate Jason made for her and rather poisoned herself. As Marina is now dead, she will not be brought to justice. On that note, both Miss Marple and Inspector Craddock depart from Gossington Hall as the end credits role.