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Watch Masterpiece Mystery online: Episode 9 Hercule Poirot: Series: X: Third Girl

Three single girls share a London flat. The first works as a secretary; the second is an artist; the third, who comes to Poirot for help, disappears believing she is a murderer. There are rumours of revolvers, flick-knives and blood stains. But, without hard evidence, it will take all Poirot's tenacity to establish whether the third girl is guilty, innocent or insane.

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