Spoiler warning: this post explains the full ending of The ABC Murders. If you have not finished the book, stop here and come back later.
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Quick answer: Hercule Poirot reveals that the killer is Franklin Clarke, who murdered his brother Sir Carmichael Clarke for his inheritance. Franklin hid that one murder among a fake series of alphabetical killings and framed Alexander Bonaparte Cust, a confused travelling salesman.
Quick facts
– Book: The ABC Murders by Agatha Christie
– First published: 1936
– Type: A Hercule Poirot mystery
– Tone of the ending: Clever and satisfying
Table of Contents
What Leads Up to the Ending
Poirot receives letters signed “ABC” announcing murders in alphabetical order: Alice Ascher in Andover, Betty Barnard in Bexhill, Sir Carmichael Clarke in Churston. An ABC railway guide is left at each scene. Cust, a man with blackouts who is near each crime, comes to believe he is the killer.
What Happens at the End of The ABC Murders
Poirot gathers the victims' relatives. He explains that the real target was Sir Carmichael and that Franklin created the series to make it look like a madman's work. Franklin chose Cust because his name and habits fit the pattern. When a fourth murder happens in Doncaster, the plan begins to unravel. Poirot reveals Franklin's fingerprints on Cust's typewriter. Franklin tries to shoot himself but Poirot has removed the bullets. Cust is cleared.
The Ending in 4 Quick Points
- The series was a cover for one murder.
- Cust was a perfect scapegoat.
- Poirot traps Franklin with evidence.
- Cust is innocent.
What Happens to the Main Characters
| Character | What happens to them |
|---|---|
| Franklin Clarke | Arrested for the murders |
| Alexander Bonaparte Cust | Cleared |
| Hercule Poirot | Solves the case |
| Captain Hastings | Narrates the story |
What the Ending Means
The ending shows Poirot's genius in seeing through patterns. The crime looks like madness but is driven by greed.
Other Ways to Read the Ending
Some readers consider it one of Christie's cleverest plots. Others focus on Cust as a tragic figure.
Themes the Ending Brings Together
Deception. The pattern hides the motive.
Greed. Inheritance drives the killer.
Justice. An innocent man is saved.
Is the Ending Happy or Sad?
Most readers describe the ending of The ABC Murders as clever and satisfying. How you feel about it usually depends on what you hoped for the characters and what you expected Agatha Christie to do with the story, so it is worth asking friends how they felt before you compare notes.
Who Will Like This Ending
Readers who enjoy endings that are clever and satisfying will find a lot to talk about here. If you prefer every thread tied up neatly, it helps to know in advance how Agatha Christie closes the story, which is exactly why many readers look it up. Either way, the final chapters reward a second look once you know where everything is heading, because small details from the middle of the book start to matter. If you are reading with a group, agree beforehand whether everyone has finished, so nobody has the last chapters spoiled.
Book Versus Adaptation
The 2018 BBC series with John Malkovich changes Poirot's backstory but keeps Franklin as the killer.
Discussion Questions About the Ending
If you are reading The ABC Murders with a book club or a friend, these questions work well once everyone has finished:
- Did the ending surprise you, or had you seen it coming from the first chapters?
- What does the final scene say about deception, and do you agree with Agatha Christie's view?
- Which character made the most important choice in the last part of the book, and was it the right one?
- How would the story feel if it had ended one chapter earlier or one chapter later?
- Does the ending leave you hopeful about the characters, or do you worry about what comes next?
- Would you describe the ending as clever and satisfying, or would you choose a different word?
How to Read the Final Chapters Again
- Compare the opening with the close. Look at how the first chapter introduces deception and how the ending answers it.
- Track each final choice. The table above shows where every main character ends up, so ask which of those outcomes was earned.
- Notice what Agatha Christie leaves unsaid. Gaps in the last pages are often deliberate, and they are where most of the debate about the ending begins.
- Listen for echoes. Images, phrases or settings from earlier in The ABC Murders often return in the final scene with a new meaning.
Questions to Ask Yourself After Finishing
- Was the ending of The ABC Murders earned by what came before it, or did it feel sudden?
- Which character's final moment affected you most, and why?
- If you could change one thing about the last chapters, what would it be?
- Did the ending change how you think about the opening pages?
Check price of The ABC Murders on Amazon
Books to Read After The ABC Murders
- The Murder of Roger Ackroyd by Agatha Christie
- Murder on the Orient Express by Agatha Christie
Related: The ABC Murders by Agatha Christie: Summary and Key Takeaways · And Then There Were None by Agatha Christie: Summary and Key Takeaways
Frequently Asked Questions
What happens at the end of The ABC Murders?
Hercule Poirot reveals that the killer is Franklin Clarke, who murdered his brother Sir Carmichael Clarke for his inheritance. Franklin hid that one murder among a fake series of alphabetical killings and framed Alexander Bonaparte Cust, a confused travelling salesman.
Is the ending of The ABC Murders happy or sad?
Most readers call it clever and satisfying.
What does the ending of The ABC Murders mean?
The ending shows Poirot's genius in seeing through patterns.
Is the ending of The ABC Murders the same in the adaptation?
The 2018 BBC series with John Malkovich changes Poirot's backstory but keeps Franklin as the killer.
Who wrote The ABC Murders and when was it published?
The ABC Murders was written by Agatha Christie and first published in 1936.
Is The ABC Murders worth reading if I already know the ending?
Yes, especially if you enjoy Hercule Poirot mysterys. Knowing the ending can make a first read richer, because you notice how Agatha Christie prepares for it from the opening chapters.
Should I read The ABC Murders before reading the ending explained?
Yes, if you plan to read it, because this post gives away the whole ending.