The Cornish Mystery (S02E04)

In "The Cornish Mystery," Poirot is called to Cornwall by Mrs. Pengelley, who fears her husband, a dentist, may be poisoning her due to his romantic interest in his young assistant. However, upon his arrival, Poirot discovers that Mrs. Pengelley has already been murdered. Determined to uncover the truth, he embarks on an investigation to identify her killer and unravel the tangled motives behind this tragic crime.