Cinematic universes have certainly been a popular idea of late. While few have copied Marvel's success, many have hoped to start a similar shared movie universe where different titans of storytelling share a story. One unexpected place where a cinematic universe opportunity has been gift-wrapped for Hollywood to cash in on may be in the novels of Agatha Christie and Kenneth Branagh's adaptations of them. In 1936, Christie created her universe with her novel Cards on the Table, where four of her famous detectives were invited to one dinner party where the eccentric host was murdered.
Source：https://www.cbr.com/kenneth-branagh-poirot-films-cinematic-universe/
