Confined to a wheelchair and crippled with arthritis, the now elderly HERCULE POIROT is reunited with his old companion CAPTAIN HASTINGS - back where it all began. Styles is the rambling country house where the pair first met 30 years ago, when Poirot was a refugee and Hastings a wounded soldier. It is also the home of their first murder investigation together - and is soon to be home to their last. Since they last met, both have faced tragedy - Hastings is a widower, and Poirot has succumbed to a life-threatening heart condition. But the great detective's brain remains as sharp and active as ever, and he tells his loyal friend with utmost certainty that Styles is again harbouring a killer - and it is simply a matter of time before the axe falls once more. The problem is, Poirot does not yet know the identity of murderer or victim, and his disability frustratingly prevents him from acting on his investigative impulses. Poirot recruits Hastings to be his "eyes and ears", but as his health deteriorates and their fellow guests begin to fall victim to confounding attacks, Poirot grows increasingly anxious that he may finally have met his match. He must summon the last of his strength and push his "little grey cells" to the very limit, as he battles his ultimate nemesis in his last ever case.