And now, the end is near… ITV has released this trailer lifting the curtain on its final four films featuring Agatha Christie's Poirot. David Suchet has worn the moustachioed Belgian sleuth's polished spats since 1988. His first film, The Adventure of the Clapham Cook, was broadcast on January 8, 1989. But on Wednesday (23 October, ITV, 8pm), The Big Four is airing – the first of the final four mysteries for the sleuth (to be followed by Dead Man's Folly, The Labours of Hercules and Curtain: Poirot's Last Case). It's been a huge undertaking for Suchet and ITV and given pleasure to millions. CrimeTimePreview raises its Homburg to them.