- Mr Shaitana – Wealthy man with a fascination for murders and murderers. In Hindi, शैतान ('Shaitana') can refer to Satan or the devil.[6] The first victim of the case
- Hercule Poirot – Belgian private detective. A guest at Shaitana's dinner party
- Ariadne Oliver – Crime fiction writer, and Poirot's friend. A guest at Shaitana's dinner party
- Superintendent Battle – Detective from Scotland Yard. A guest at Shaitana's dinner party
- Colonel Race – Secret Service agent. A guest at Shaitana's dinner party
- Dr Geoffrey Roberts – Physician. A guest at Shaitana's dinner party who may have killed one of his own patients
- Mrs Lorrimer – Widow and expert bridge player. A guest at Shaitana's dinner party who may have killed her husband. The second victim of the case
- Major John Despard – Explorer and hunter. A guest at Shaitana's dinner party who may have shot and killed someone while on an expedition
- Anne Meredith – A young woman, formerly a personal companion. A guest at Shaitana's dinner party who may have killed one of her employers. She dies from drowning during the case
- Rhoda Dawes – Anne's wealthy friend and flatmate
- Mrs Luxmore – A widow whose husband died in suspicious circumstances in South America, not an attendee of Shaitana's dinner party
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