After the Funeral - Agatha Christie

After the Funeral is a classic Hercule Poirot mystery by Agatha Christie, first published in 1953. The story begins with the funeral of Richard Abernethie, a wealthy man whose death seems natural—until his sister, Cora Lansquenet, suddenly suggests he was murdered. The next day, Cora herself is found brutally killed, raising suspicions among the family members.