Ep 7. Double Sin

Poirot season 2 episode 7, titled "Double Sin," follows the famous detective Hercule Poirot as he is approached by wealthy businessman, M. Claude Langton, to investigate the disappearance of his wife and her sister while on a vacation in Europe. Initially dismissive of the case, Poirot's interest is piqued when he learns that M. Langton had sent his wife and sister-in-law off unchaperoned.

As Poirot delves into the case, he discovers a complicated web of deception and betrayal. The two sisters, Sylvia and Valerie, were polar opposites - Sylvia was vivacious and flirtatious while Valerie was a quiet, dignified woman with a secret past. Poirot quickly realizes that the sisters' dynamic played a large role in their disappearance, and that several of the people they encountered on their travels may have been involved.

As he digs deeper into the case, Poirot learns that the disappearance may have been intentionally staged to throw off suspicions of murder. The sisters had been spotted alive and well in various locations, seemingly without a care in the world. But as Poirot uncovers more clues, he realizes that the playful, carefree facade was just that - a facade to hide a much darker truth.

"Double Sin" is a classic whodunit that keeps viewers guessing until the very end. Poirot's attention to detail and sleuthing skills are on full display in this episode, as he works tirelessly to unravel the mystery behind the Langton sisters' disappearance. With an intricately woven plot and an array of complex characters, "Double Sin" is a must-watch for fans of the detective genre and anyone who loves a good mystery.