After a seemingly neurotic young heiress tells Ariadne Oliver and Poirot that she thinks she may have killed someone, her ex-nanny is found with her wrists slashed.



(novel), (screenplay)

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Episode cast overview, first billed only:
David Yelland ...
Norma Restarick
Claudia Reece-Holland
Frances Cary
David Baker
John Warnaby ...
Inspector Nelson
Caroline O'Neill ...
Nanny Lavinia Seagram (as Caroline O'Neil)
Andrew Restarick
Sir Roderick Horsfield
Lucy Liemann ...
Tim Stern ...
Alf Renny
Bus Ticket Inspector
Tessa Bell-Briggs ...
Daphne the Waitress


Poirot is visited by a distraught girl, Norma Restarick, who fears she may have killed someone but runs away, telling him that he's too old rather than explaining further. By coincidence, Poirot's friend Ariadne Oliver lives in the same apartment block as Norma and her two roommates and recently went to their party, where Norma was distressed when she was offered ice cream. Norma's ex-nanny, Miss Lavinia Seagram, an alcoholic, also lived in the block but was recently found dead, with the verdict being suicide. Ariadne is unconvinced and searches the nanny's apartment, finding a clue which she puts in her handbag. Soon afterward she is attacked and the bag and its contents are stolen. Poirot visits the Restarick family home in the country, owned by Norma's great-uncle, Sir Roderick, an elderly and half-blind man who is dependent upon Sonia, his young personal assistant (who may well be a gold-digger). Andrew Restarick, Norma's father, explains to Poirot that he spent much of Norma's ... Written by don @ minifie-1

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Release Date:

18 July 2010 (USA)  »

Company Credits

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Technical Specs


| (11 episodes)


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Did You Know?


The title of Ariadne Oliver's most recent novel mentioned in this episode, "Lady, Don't Fall Backwards", is named after the fictional detective novel at the heart of the plot of the episode of the British radio comedy "Hancock's Half Hour" called "The Last Page". See more »


Nurse: [Referring to Ariadne who's just suffered a concussion] She's delirious!
Ariadne Oliver: No, I'm not!
Hercule Poirot: I assure you, this is how she is.
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User Reviews

A Deep, Tragic and Simultaneously Wonderful Production and Story
17 December 2013 | by (United Kingdom) – See all my reviews

Having not read the Agatha Christie novel (which I understand has an unusually low reputation), I watched 'Third Girl' without a clue as to its plot. Already a David Suchet's Poirot convert, I had usually high expectations of this - I was watching it from my box-set. After watching it, both my mother and I agreed that it was one of the best Agatha Christie's Poirot episodes, along with 'Murder on the Orient Express'. As always, David Suchet enchants as the compassionately stunning Hercule Poirot, and this time, Zoe Wanamaker co-stars as the formidable Ariadne Oliver, a crime-writer. Both turn the plot over like fine soil, growing from it flowers most beautiful and utterly compelling. The visual nature of the production is phenomenal, with many observe-and-discover scenes working one's little grey cells. The supporting cast is remarkably diverse, with a subsequent elegance resulting from their talent - as well as peppering the 1930s setting with glamorous thrill. The chase scene with Ariadne Oliver is superb, and the wonderful location within the walkway of pillars is a banquet for the eyes. However, the general plot is not all light-hearted fun and games, for behind its seeming innocence, there lies a tragic coldness brought to a chillingly sharp point by the cast. To conclude, I believe this drama to be a masterpiece for the senses, a workout for the brain, and a philosophical quandary to ponder both during and after watching it. Five stars, ten out of ten, one hundred percent.

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