Murder on the Orient Express Twist Ending Explained

It's no secret there's a twist at the end of Murder on the Orient Express. It's not just an Agatha Christie murder mystery, but quite possibly her very best; a twisted take on the genre she owned that pushes iconic detective Hercule Poirot to the limits of his morals. Kenneth Branagh's 2017 movie, which he both directed and stars in, is a glossy, star-studded but mostly faithful take. With the film finally in cinemas, let's discuss that 73-year-old shocker.

Murder of the Orient Express introduces us to Poirot in Jerusalem where he's solving a crime with typically Sherlockian logic, but that's all preamble to the real meat. Forced to travel back to England to help with a previous investigation, he takes the Orient Express - along with a surprisingly large group of other passengers considering it's the height of winter. Things immediately feel off, and shortly after an avalanche derails the train, a body is discovered...

Related: Murder on the Orient Express Review: An Old Fashioned Stylish Mystery

There Are Twelve Killers, All Connected To The Victim

The victim in question is Samuel Ratchett, played by Johnny Depp. With an ominous scar over his right eye (something that immediately irks the OCD Poirot), we're at first led to believe his prior crimes go as far as selling fake rugs to gangsters, but the truth quickly emerges after his death. He's actually John Cassetti, who a few years prior kidnapped baby Daisy Armstrong from her parent's house and, after getting paid the ransom, murdered her, causing mother Sonia to fatefully miscarry and pushing the father to suicide. However, despite being known as the killer, he got away with it; due to a series of unfortunate events, a maid was wrongfully convicted of the crime.

And so we get the film's intense form of vigilante justice; thirteen people with some connection to the Armstrongs and the ensuing investigation band together to get their revenge. They each have a part to play, ensnaring Cassetti in an elaborate trap that culminates with them all together on the isolated Orient Express. Before getting into how they actually did the murder, though, let's break down how they're all connected:

  • Linda Arden (Michelle Pfeiffer) - The mother of Sonia and grandmother of Daisy. A former stage performer (under a pseudonym).
  • Pilar Estravados (Penelope Cruz) - Daisy's nanny, she was asleep when Cassetti broke into the Armstrong house (and became a nun after incident).
  • Gerhard Hardman (Willem Dafoe) - A former detective, he worked on the Armstrong case and fell for the maid convicted of the killing.
  • Princess Dragomiroff (Judi Dench) - A friend of Sonia's and Daisy's Godmother.
  • Hildegarde Schmidt (Olivia Coleman) - The Armstrongs' cook, now Princess Dragomiroff's assistant.
  • Hector MacQueen (Josh Gad) - The son of the disgraced District Attorney who worked the Armstrongs, now positioned as Cassetti's secretary.
  • Edward Henry Masterman (Derek Jacobi) - A war buddy of Colonel Armstrong and later his butler, posing as Cassetti's valet.
  • Mary Debenham (Daisy Ridley) - The Armstrongs' governess.
  • Dr. Arbuthnot (Leslie Odom Jr.) - A war comrade and close friend to Armstrong, who helped get him into medical school.
  • Countess Elena Andrenyi (Lucy Boynton) - Real name Helena Goldenberg, she was Sonia Armstrong's sister and Daisy's aunt.
  • Count Rudolph Andrenyi (Sergei Polunin) - Helena's husband.
  • Biniamino Marquez (Manuel Garcia-Rulfo) - The Armstrongs' chauffeur.
  • Pierre Michel (Marwan Kenzari) - The brother of the wrongly-accused nurse, now the Orient Express' conductor (not one of the killers but still in on the murder).

As Poirot investigates, he discovers these connections and, in light of the high level of contradictory evidence from the suspects, forms two possible solutions: the first is that one of Ratchett's mob enemies snuck on the train and killed him; the second is that they're all guilty. He correctly rationalizes that the more horrifying latter is correct, and reveals his conclusion to the Last Supper-arranged murderers (standing in for the classic parlor).

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How They Actually Did The Murder

Pfeiffer's Arden is the mastermind behind the plan, bringing together the others in a bid for revenge. They know they need somewhere remote and isolated for the murder where they can't be interrupted, and the Orient Express is decided as the ideal staging ground. MacQueen and Masterman pose as Ratchett's underlings, ensuring that he ends up on the train, while the rest position themselves ready to spring. The basic plan is to drug Ratchett (putting the Countess' prescription in his coffee) and then have all twelve stab him once - to both enact justice and keep the true killing blow a mystery. Pretty simple, really.

Things only really get complicated with the entrance of Poirot: when he's put on the train at the last minute right next to Ratchett's cabin (which was originally booked by the no-show Harris), the murderers need to construct an alternate narrative to distract the detective. After a false commotion to distract Poirot and disorient him to the murder specifics, most of this involves simple lies when his interrogates them - they craft a fake series of events that creates the mystery of the short, high-pitched conductor on the train - but they also drop plentiful false clues like the adjusted time on the stopwatch and rogue guardsman button, as well as hiding evidence in his luggage and allowing him to catch a glimpse of Debenham in the red dressing gown. They'd, of course, had to have been secretive even without Hercule next door due to the train's crew, but it was only really his involvement that led to them having to so intricately act out and frame the evening's events.

There are some key aspects of the case from the book that aren't in the film. Poirot is clued in that something is wrong by the smelting pot of backgrounds that make up the train's inhabitants - it's so diverse he rationalizes could only happen in America, alluding to a prior meeting - while the express changing time zones leads to a confusion over when the murder took place. There are other subtle changes (the guardsman is one of the killers originally) but the ethos of the killing is the same. What differs a little is the resolution.

Why Poirot Decides To Let Them Go

Perhaps a bigger shocker than the baker's dozen of killers is that Poirot lets them get away with it; he tells the first, false story of a stowaway to the authorities who buy it because, well, he's Poirot. This feels like a major betrayal of everything he stands for - especially Branagh's fastidious take - but really represents an evolution of his character and greater appreciation of the moral gray of his chosen area of expertise. Yes, the group has killed a man, but Cassetti's acts also left them damaged and emotionally scarred. This isn't a simple act of vigilante justice - an eye for an eye - rather a way for them to perhaps get over the damage he wrought. When Arden tries to commit suicide rather than silence the man who feels compelled to reveal the truth, he realizes the permutability of blame.

Near the start, Poirot says to Ratchett he's of an age where he knows what he likes and what he doesn't; the twist challenges that, showing it's never too late to change and grow. And while at first this seems to irreversibly break the detective's resolve and make him want to step away from his profession - he initially ignores a call for help - after a pause for recollection he's right back in it, ready for a new adventure.


This version of Murder more than any other feels like it wants to be a dissection of Poirot, exploring what makes such a unique individual tick. Doing so with this particular mystery is a very smart entrance to that as it intrinsically undermines his ideals and then sees him come out stronger.

Murder on the Orient Express is a subversion of the murder mystery - a whodunnit where everyone done it - that uses the tropes you expect against you; most of the "evidence" is a distraction by the victims. What Branagh's done is taken that and used it to further explore our detective.

Next: Does Murder On The Orient Express Have a Post-Credits Scene?