Hercule Poirot's Christmas
Agatha Christie
 It is Christmas Eve and everyone in the house hears the crashing of furniture, followed by a wailing and hideous scream. When they get to Simeon Lee's room, they find it locked and they have to break the door down. When they finally get through the door, they find heavy furniture overturned and Simeon Lee dead, his throat slit, in a great pool of blood. Superintendent Sugden notices Pilar Estravados pick up something from the floor. She tries to conceal what she picked up, but when pressed, opens her hand to show a small bit of rubber and a small object made of wood. Superintendent Sugden explains that he is in the house by prior arrangement with the victim, who confided to him the theft of a substantial quantity of uncut diamonds from his safe. When Poirot is called in to investigate, there are therefore several main problems: who killed the victim? How was the victim killed inside a locked room? Was the murder connected to the theft of the diamonds? And what is the significance of the small triangle of rubber and the peg that Sugden is able to provide when reminded by Poirot of the clue that had been picked up by Pilar? Poirot’s investigation explores the nature of the victim – a methodical and vengeful man – and the way that these characteristics come out in his children. He seems focused on the idea that one of the immediate family is the murderer. When the butler mentions his confusion about the identities of the house guests, Poirot realizes that the four legitimate sons may not be the only heirs of Simeon’s temperament. The final major clue is dropped by Pilar, who while playing with balloons and one bursts, lets slip that what she found on the floor must also have been a balloon. She knows more than she realizes. Poirot warns her to be careful.