- Edward George Armstrong – a Harley Street doctor
- William Henry Blore – a former police inspector, now a private investigator
- Emily Caroline Brent – an elderly, pious spinster
- Vera Elizabeth Claythorne – a young woman on leave from her position as a sports mistress at a girls' school
- Philip Lombard – a soldier of fortune
- General John Gordon MacArthur – a retired World War I general
- Anthony James Marston (Tony Marston) – an amoral and irresponsible young man
- Ethel Rogers – the cook/housekeeper and Thomas Rogers' wife
- Thomas Rogers – the butler and Ethel Rogers' husband
- Lawrence John Wargrave (Mr Justice Wargrave) – a retired criminal judge
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