Poirot helps Chief Inspector Japp try to find a jewel thief, but is sidetracked when a bewitching Russian countess arrives on the scene. It was first published as a book in the 1961 US collection Double Sin and Other Stories, and was published in the UK in the collection Poirot’s Early Cases in 1974. The episode is an adaptation of the Agatha Christie short story of the same name and was directed by Andrew Piddington with dramatisation by Anthony Horowitz. Find out when Agatha Christie's Poirot is on TV, including Series 3-Episode 7: The Double Clue. The owner is perplexed. Publication in the US followed in Blue Book Magazine in 1925. Directed by Andrew Piddington. With David Suchet, Hugh Fraser, Philip Jackson, Pauline Moran. The Double Clue is a Hercule Poirot short story first published in the UK (Sketch Magazine) on December 5, 1923. When valuable rubies and an emerald necklace are stolen during a tea party, Poirot is brought in to help investigate the case. The Double Clue is the seventh episode of series 3 of the ITV British television drama series Agatha Christie's Poirot featuring David Suchet as Hercule Poirot, first broadcast on 10 February 1991 in the UK. This story was adapted for the TV series Agatha Christie’s Poirot in 1991 and starred David Suchet in the title role.