Well, you know everything now, M. Poirot. What are you going to do about it? If it must all come out, can't you lay the blame upon me and me only? I would have stabbed that man twelve times willingly. It wasn't only that he was responsible for my daughter's death and her child's, and that of the other child who might have been alive and happy now. It was more than that. There had been other children before Daisy--there might be others in the future. Society had comdemned him; we were only carrying out the sentence. But it's unnecessary to bring all these others into it. All these good faithful souls--and poor Michel--and Mary and Colonel Arbuthnot--they love each other...
~ Linda Arden's coffession after her true identity being revealed.

Linda Arden, also known as Caroline Hubbard, is one of the major protagonists in Agatha Christie's 1934 Hercule Poirot novel, Murder on the Orient Express and its adaptation, and arguably its (false) main antagonist due to being the lead culprit of Lanfranco Cassetti's murder.

On board the train, she masquerades as a woman named Caroline Martha Hubbard. In the 1974 movie, she uses the alias Harriet Belinda Hubbard.

She has been portrayed on screen by various actresses, including the late Lauren Bacall in 1974, Meredith Baxter in 2001, Barbara Hershey in 2010, and Michelle Pfeiffer in 2017.


Linda Arden, being referred to by this stage name, is the mother of Countess Andrenyi and the late Sonia Armstrong, as well as the grandmother of the late Daisy Armstrong. She is also the main prepertrator to murder Samuel Ratchett a.k.a Lanfranco Cassetti in order to avenge her dead family and find righteousness for Cassetti's victims.

During the journey Linda Arden travelled as Mrs. Hubbard, and was ostensibly travelling back to America after visiting her daughter and son-in-law who were on the staff of a big American college in Smyrna, Turkey. She occupied compartment 3 which had a connecting door with Ratchett's compartment. The unexpected presence of Poirot on the train required the group deivse various misdirections for his benefit. Linda, in particular, created a commotion around 1.15 a.m. insisting that there was someone in her compartment. Some time later she joined the other members of the group to stab Ratchett in turn.

After the murder, Linda also produced a sham Oriental dagger and a train conductor's uniform button as possible clues. She said that she found the dagger in her sponge bag which had been hanging on the handle of the connecting door with Ratchett's compartment.

Poirot in investigating the killing, subsequently surmised Mrs. Hubbard's true identity as the mother of Sonia Armstrong and grandmother of Daisy. During the denouement, Linda offered to take the blame for everyone else, saying that she "would have stabbed that man twelve times willingly." It was, she pleaded, unnecessary to bring all the others into it.

Linda Arden was eventually spared alongside other killers due to Poirot being sympathized with their motives.

In the adaptations

1974 film

In the 1974 film, Linda was shown to be the first to stab Ratchett/Cassetti, saying it is for her daughter and graddaughter. She then passes the dagger to Colonel Arbuthnot.

2001 film

In the 2001 film, Linda's role remained mostly faithful to the novel. At the end of the show, Poirot (in a voiceover) said that Caroline Hubbard went on to perform in Salt Lake City at a dinner theatre production of Agatha Christie's The Mousetrap.

2010 film

In the 2010 television film adaptation from Agatha Christie's Poirot, Linda is shown to be the penultimate person who stabbed Samuel Ratchett / Lanfranco Cassetti, before she gave the dagger to Princess Dragomiroff to finish the final blow.

2017 film

In the 2017 film version, Mrs. Hubbard/Linda Arden was presented as an even more struggling and conflicted character, who was shown to have suffered from emotional stress on the terms of killing Cassetti.

This part was particularly explored within the climax, when she pledged Poirot to arrest her alone and spare all the others. Poirot gave her Hardman's revolver, which he had confiscated, urging her to shoot him if she and the others wanted to avoid arrest and let everything gone unnoticed, since he could not lie to the police.

However, Linda Arden refused to kill Poirot and stated she had already died with Daisy. She attempted to shoot herself instead, much to everyone else's horror, but turned out it was an empty pistol, Poirot wanted to see how the suspects would react and her reaction confirms none of them are truly killers at heart. Realizing this, Linda broke down in tears. Alongside the other killers, Linda was spared by Poirot and gone free.


2017 film

No one should hang for this but me! It was my plan! Tell the police that it was me, alone. There's no life left in me anymore. They... have a chance now. Helena, I pray, has a... has a chance. They can... go, live, find some joy somewhere. Let it end with me. They're not killers. They're good people. They can be good again.
~ Linda Arden's pleadge to Poirot for sparing her family and friends (in the 2017 film)
I already died with Daisy.
~ Linda Arden's refusal to kill Poirot (in the 2017 film)




  • Mrs. Hubbard/Linda Arden's role as the ringleader of the twelve culprits can actually make her the main antagonist of Murder on the Orient Express. However, considering the culprits' motives are to avenge their deceased love one and, most importantly, to seek righteous justice, as well as Linda Arden's own refusal to murder innocent people (including Poirot), Mrs. Hubbard is not a genuiue antagonist or villain. Therefore, Cassetti is the only antagonist in the novel.
  • It is stated that Linda Arden is only "Mrs. Hubbard's" most famous stage name instead of her real name. The real full name of Linda Arden remains unexplained in either novel or any of the adaptations.


Agatha Christie's signature.png Heroes

Main Detectives
Hercule Poirot | Jane Marple
Secondary Detectives
Parker Pyne | Mr. Quin | Tommy and Tuppence Bresford
Amateur Detectives
Colonel Johnnie Race | Superintendent Battle | Bobby Jones | Frances Derwent | Arthur Calgary | Reniseb | Charles Hayward | Mark Easterbrook

Righteous Culprits
Mary Debenham | Princess Natalia Dragomiroff | Hector MacQueen | Edward Masterman | Colonel John Arbuthnot | Linda Arden | Count Rudolph Andrenyi | Countess Helena Andrenyi | Greta Ohlsson | Pierre Michel | Antonio Foscarelli | Hildegarde Schmidt | Cyrus Hardman | Edith de Haviland | Hercule Poirot
Short Stories
Madame Déroulard | Ronnie Oglander

Supporters, Victims & Others
Captain Arthur Hastings | Inspector Japp | Felicity Lemon | Ariadne Oliver | George the Butler | Superintendent Spence | Colonel Johnnie Race | Superintendent Battle | Countess Vera Rosakoff | Raymond West | Joyce Lemprière
Victims & Attempted Victims
Alexander Bonaparte Cust | Miranda Butler | Mrs. Otterbourne | Pilar Estravados | Olga Seminoff
Bella Duveen | Colonel Carbury | Dr. Stavros Constantine | Dr. Gerard | Dulcie Duveen | Ginerva Boynton | Hori | Judith Butler | Lydia Lee | Miss Bulstrode | Monsieur Bouc | Monsieur Giraud | Nadine Boynton | Rosalie Otterbourne | Sarah King | Sophia Leonides | Stephen Farr | Tim Allerton | Valerie Saintclair | Virginie Mesnard

Adaptational, Homage & Non-canonical
Benoit Blanc | Marta Carbera | Linda Drysdale

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