Miss Marple is an elderly amateur detective from the village of St. Mary Mead. She presents herself as a benign, scatterbrained woman who enjoys knitting. This harmless demeanor causes suspects and officials alike to underestimate her intelligence. Beneath her innocent appearance, she is sharply observant of human nature and highly skilled at identifying behavioral patterns. She temporarily moves to the Vicarage in Chipping Cleghorn to assist the police with the unfolding investigation.

Letitia is a woman in her sixties who owns the Little Paddocks estate in Chipping Cleghorn. She possesses an aristocratic bearing, a resolute face, and an authoritative manner that commands respect from her household. She always wears a large pearl choker that visually clashes with her typical rustic country tweeds. As the apparent target of the advertised murder, she tries to maintain her composure while her home becomes the center of a major police investigation.

Inspector Craddock is the lead police detective assigned to investigate the Chipping Cleghorn shooting. He is an attractive, intelligent professional who must bridge the gap between traditional policing and the complex social dynamics of a rural village. Faced with contradictory witness statements and shifting identities in post-war Britain, he methodically questions the local residents to determine the true motive behind the attack.

Dora is Letitia Blacklock's childhood friend and companion, affectionately known by the nickname "Bunny." She moved into Little Paddocks after writing to Letitia about her struggles with poverty and failing health. Dora is highly forgetful and easily flustered, frequently creating more trouble for the household than she prevents. She holds a strong sentimental attachment to the house's furnishings and closely monitors the physical details of her environment.

Phillipa is a young, fair-haired lodger at Little Paddocks who works as a gardener at the nearby Dyas Hall. She supports her eight-year-old son at boarding school following the reported death of her husband in World War II. Reserved and composed, she rarely shares details about her personal life and maintains a stoic exterior that makes it difficult for others to guess her thoughts.

Patrick is a university student in his twenties staying at Little Paddocks with his distant older cousin, Letitia Blacklock. He has a reputation as a practical joker with a flippant, devil-may-care attitude. He treats the ensuing police investigation with an air of amusement rather than concern, loudly highlighting the generational divide between the young residents and the anxious older villagers.

Julia is a young woman staying at Little Paddocks, ostensibly training as a pharmacist at the local hospital. She shares her brother Patrick's bored, cynical disposition and appears completely unfazed by the violence that occurs in the house. She observes the older villagers with detached amusement and refuses to take their fears seriously.

Mitzi is an Eastern European refugee employed as the cook and housekeeper at Little Paddocks. Having lost her family during the war, she is deeply traumatized and intensely paranoid, frequently accusing others of conspiring against her. Her dramatic outbursts and constant threats to resign exasperate the household, but Letitia retains her employment due to the post-war shortage of domestic workers.

Mrs. Swettenham is an older widow who recently moved back to England from India following the death of her husband. She struggles to adjust to post-war austerity and the loss of her former privileged lifestyle. A cheerful but nervous chatterer with grey curls, she is highly invested in local village gossip and frequently drops in on her neighbors uninvited.

Edmund is a tall young man with large spectacles who lives with his mother. He aspires to write a gritty, serious novel but spends most of his time lounging at home and complaining about the state of the world. He represents the cynical, directionless youth of post-war Britain, showing little motivation to find traditional employment while pursuing romantic interests in the village.

Miss Hinchcliffe is a practical, assertive woman who manages a small farm at her cottage, Boulders. She dresses in corduroy slacks and a battledress tunic, possessing a booming voice and a no-nonsense approach to rural life. She uses logical reconstruction and physical reenactments to make sense of the crime, actively trying to piece together the chaotic events of the blackout.

Miss Murgatroyd is a sweet-natured, absent-minded woman who lives at Boulders. She has disorganized, curly hair and lacks confidence in her own abilities, generally deferring to her housemate's judgment. Because of her physical position behind a door during the holdup, she has a unique perspective on the crime scene that makes her vital to the investigation.

Colonel Easterbrook is a pompous, retired military officer who recently returned to England from India. He considers himself an authority on all subjects and regularly lectures the other villagers on military tactics and police procedures. He treats his much younger wife like a child and remains largely oblivious to the shifting social dynamics around him.

Mrs. Easterbrook is a glamorous young woman with synthetic blonde hair, married to a significantly older retired military man. She flatters her husband constantly, feigning ignorance and helplessness to manipulate his decisions. Her outward persona of innocence hides a calculating nature and a secretive past.

Julian is the kindly, intellectual vicar of Chipping Cleghorn. He is a gentle man who tends to overcomplicate his sermons with academic references that his rural congregation struggles to follow. He remains largely removed from the village gossip, focusing instead on his ecclesiastical duties and his affection for his wife.

Diana, universally known by her nickname "Bunch," is the cheerful, round-faced wife of the local vicar. She openly calls herself stupid but possesses a straightforward, honest perspective that cuts through the other villagers' pretensions. She happily hosts Miss Marple at the Vicarage during the investigation, eager to assist in any way she can.

Belle is the wealthy, terminally ill widow of a millionaire financier. Despite her failing health, she maintains an intense love for life and speaks with warm nostalgia about the past. Her impending death creates the legal conditions that will transfer her late husband's massive fortune to his former secretary.

Rydesdale is a high-ranking police official with shrewd eyes and bushy brows. He commands quiet authority and expects results from his subordinates. While professional and competent, he is initially dismissive of amateur theories and eager to close the case as a simple suicide or accident.

Sir Henry is a tall, distinguished retired commissioner of Scotland Yard. He has seen enough unusual cases to recognize that traditional police methods sometimes fall short. He serves as a vital bridge between the official police force and Miss Marple, eagerly advocating for her inclusion in the investigation.

Scherz is a Swiss national working as a receptionist at the Royal Spa Hotel in Medenham Wells. He has a history of petty theft and altering checks, but no record of violent crime. His death during the staged holdup at Little Paddocks triggers the central murder investigation.

Tiglath Pileser is the resident cat at the Chipping Cleghorn Vicarage. Named after an ancient Assyrian king, this energetic feline creates a brief moment of chaos involving a chewed wire and spilled water. His destructive playtime inadvertently recreates the exact conditions of the Little Paddocks blackout.

Sergeant Fletcher is a local police officer assisting with the murder investigation. He questions the reliability of the household staff and guards the crime scene to ensure no evidence is tampered with while his superiors build their case.