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.