Jane is an elderly, unmarried amateur detective living in the quiet village of St. Mary Mead. She possesses a razor-sharp intellect hidden behind a mild, unassuming exterior. She solves complex crimes by drawing parallels between the murder and mundane village incidents. She recognizes that human nature remains consistent regardless of the setting or social class.

An 18-year-old professional dancer working at the Majestic Hotel in Danemouth. Born into a working-class entertainment family as Rosy Legge, she presents a striking figure with platinum blonde hair, heavy makeup, and flashy clothes. Her youth captures the attention of an elderly hotel guest, triggering resentment from his heirs. She possesses ambitions beyond her current station.

A competent dancer and bridge hostess in her late twenties working at the Majestic Hotel. She dresses conservatively and serves as a stabilizing presence among the hotel guests, expertly smoothing over social friction. She invites her younger cousin to fill in for her after suffering a sprained ankle, a decision she appears to deeply regret.

The tall, restless son-in-law of Conway Jefferson. Following the death of his wife eight years prior, he lives rent-free with his wealthy father-in-law and relies entirely on his financial support. He speaks bluntly, struggles with gambling debts, and openly expresses his hatred for the young dancer who threatens his inheritance.

A strong-willed older man residing for the season at the Majestic Hotel. Despite losing both his legs and his children in a devastating plane crash eight years ago, he retains an imposing physical presence. Desperately lonely, he forms a sudden, obsessive infatuation with a young dancer, intending to legally adopt her and alter his will in her favor.

Conway's widowed daughter-in-law, an attractive woman of 35 with a radiant smile. Like Mark, she lives with Conway and depends on him financially to support herself and her young son. She carefully manages her social life to avoid upsetting her sensitive father-in-law while secretly chafing against the tight constraints placed upon her personal freedom.

An elderly retired military man who owns Gossington Hall in St. Mary Mead. He values his strict routine and his quiet library above all else. He finds himself highly distressed when local gossips immediately assume he is having an affair with the scandalous young woman found dead on his property.

The energetic and loyal wife of Colonel Bantry. Rather than panicking over the grisly discovery in her home, she finds the mystery thrilling and immediately calls in Miss Marple to investigate. She acts as an active partner to her friend, moving into the Majestic Hotel to gather information and clear her husband's name.

A flashy young man who works as a film technician. He willfully antagonizes the conservative residents of St. Mary Mead by hosting loud parties and cultivating a decadent image. He openly mocks the local authorities, putting himself firmly in their crosshairs as a primary suspect when evidence connects him to the victims.

The authoritative former head of Scotland Yard. He operates as an unofficial private investigator for Conway Jefferson. He holds immense respect for Miss Marple's abilities and serves as a vital bridge between her intuitive methods and the rigid procedures of the official police force.

A tall, handsome professional dancer and tennis coach at the Majestic Hotel. He claims to be descended from an impoverished aristocratic family in Devonshire, using this tragic backstory to appeal to the wealthy guests he tutors and dances with.

A highly energetic and efficient local police inspector in St. Mary Mead. He focuses intensely on concrete evidence and immediate suspects, entirely dismissing Jane Marple's psychological insights as irrelevant nonsense.

The Chief Constable of the county. He must balance his official duties with his personal friendship with Colonel Bantry, struggling to maintain objectivity when his friend becomes the center of a scandalous murder investigation.

A police detective for Glenshire County, where the Majestic Hotel is located. He proves far more perceptive than his local counterparts and readily recognizes Miss Marple's investigative value, offering her a larger role in the inquiry.

A nervous, stammering hotel guest who seems perpetually confused. He is the last person known to have seen Ruby alive and further complicates the investigation when his car, a Minoan 14, goes missing from the hotel courtyard.

A 16-year-old Girl Guide who fails to return home after a local rally. Described as young for her age and highly innocent, her sudden disappearance adds a darker, more urgent layer to the police investigation.

A tall, middle-aged man who has been quietly but persistently courting Adelaide Jefferson for years. He stays at a cheaper nearby hotel but frequently visits the Majestic to spend time with her, harboring jealousy toward her younger admirers.

A platinum-blonde young woman living with Basil Blake in St. Mary Mead. She purposefully cultivates a scandalous image to outrage the conservative villagers, though she engages in deeply domestic arguments with her partner.

Adelaide Jefferson's nine-year-old son from her first marriage. An avid fan of detective stories, he views the murder at the hotel as a thrilling adventure and eagerly collects macabre evidence to show his friends.

A young Girl Guide and friend of Pamela Reeves. She harbors knowledge about Pamela's true plans on the day she disappeared, struggling with guilt and fear over her friend's fate until Jane Marple pressures her to confess.

The manager of the Majestic Hotel in Danemouth. He cares deeply about the reputation of his establishment and is highly irritated that a guest reported a missing person, fearing the resulting scandal will drive away business.

Conway Jefferson's personal butler. He observes the family dynamics closely and holds a deeply unfavorable view of Ruby Keene, believing her to be entirely motivated by his employer's wealth.