At a London restaurant where he often eats, Poirot notices that another regular customer has diverted from his usual meal. As old Anthony Gascoigne lies dying in Brighton, his estranged twin brother, Henry, falls to his death. A tragic accident, or murder? Poirot begins to see connections and decides the answer to the mystery lies in a blackberry pie.
Country squire Marcus Waverly calls on Poirot for help in dealing with kidnap threats against his son. Hastings is appalled by the thought of someone going around kidnapping children and it becomes a race against time to find the identity of the mystery letter writer.
Within hours of the Bonfire Night fireworks beginning Poirot finds himself investigating a violent death in Hastings' mews garage.
A Mrs Ernestine Todd, from Clapham, asks Poirot to help her find her cook, Eliza, who has disappeared. Poirot, who aims to accept only really significant cases, is at first insulted by such a trivial request. However, after he sees the contents of the missing cook's trunk, he decides the case could prove to be worthy of his talents.
As Jeff is drafted to help lead Greendale's debate team against the formidable City College, Abed's film-class projects appear to predict the future.
Jeff is forced out of his condo and into Abed's dorm room, and Annie looks to get Troy's attention by helping him plan a romantic picnic.
Jeff sets his sights on an attractive professor, and Annie looks to boost her social standing by hosting a Day of the Dead party.
Annie's dream of being the ex-football star's girlfriend is in jeopardy when Jeff is blackmailed into getting Troy to join Greendale's football team.
As Pierce volunteers to compose a new school song, a cheating episode in Spanish class leaves Jeff defending Britta before a disciplinary tribunal.
As Annie recruits Abed and Troy for a psychology class experiment, Jeff and Shirley bond over their mutual fondness for gossip.