The Four Detectives
- Superintendent Battle, a top detective from Scotland Yard who likes to project a professional image of stolidity, with a wooden expression
- Colonel Race, a debonair Secret Service agent, about 50 years old
- Ariadne Oliver, writer of popular detective fiction, very reminiscent of Agatha.
- Hercule Poirot, the famed private detective
The Four Suspects
- Dr Roberts, a successful physician, bright but showing signs of age
- Mrs Lorrimer, a well-to-do, expert bridge player, long widowed, 63 years old
- Major Despard, a dashing explorer and sport hunter
- Anne Meredith, a pretty young woman, 25 years old
- Rhoda Dawes, Anne's wealthy friend and housemate, lively, direct and polite
- Mrs Luxmore, whose husband died in suspicious circumstances
- Miss Burgess, loyal secretary of Dr Roberts
- Elsie Batt, former parlourmaid of Mrs Craddock, who had been a patient of Dr Roberts
- Sergeant O'Connor, extremely handsome and tall, with a good way of getting stories from women for police investigations
- Mr Shaitana, a collector of all rare things, including murderers; very rich and mysterious (ironically, the name Shaitana means a 'the naughty one' in Hindi and is sometimes used to allude to the devil').
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