Agatha Christie's Poirot - Season 2 - Eps 4: The Cornish Mystery
Poirot travels to Cornwall, summoned by a Mrs Pengelley, who suspects her dentist husband is poisoning her because he's fallen in love with his young assistant. Unhappily, Poirot finds Mrs Pengelley dead on his arrival, so he sets out to catch her killer.
About Agatha Christie's Poirot

Title: Agatha Christie's Poirot
First Air Date: 1989-01-08
Last Air Date: 2013-11-13
Status: Ended
Rating: 8.168/10 (from 506 votes)
Language: EN
Seasons: 14
Total Episodes: 70
Network: ITV1
Genres: Crime, Drama, Mystery
Production Companies: The Computer Film Company, Picture Partnership Productions, Carnival Films, LWT, GBH, A+E Studios, Agatha Christie Limited, Masterpiece, Granada Productions
Synopsis
From England to Egypt, accompanied by his elegant and trustworthy sidekicks, the intelligent yet eccentrically-refined Belgian detective Hercule Poirot pits his wits against a collection of first class deceptions.
Cast

David Suchet
Hercule Poirot