Christie also wrote several stand-alone novels outside of her popular collections, including:
- "The Floating Admiral" (1931)
- "The Sittaford Mystery" (1931)
- "Why Didn't They Ask Evans?" (1934)
- "And Then There Were None" (1939)
- "Death Comes as the End" (1945)
- "Crooked House" (1949)
- "They Came to Baghdad" (1951)
- "Destination Unknown" (1954)
- "Ordeal by Innocence" (1958)
- "The Pale Horse" (1961)
- "Endless Night" (1967)
- "Passenger to Frankfurt" (1970)