Poirot's investigation explores the victim's methodical and vengeful nature and the way these characteristics come out in his sons, and observes physical traits as well. Each son, and perhaps one of the wives, appears as a suspect to the investigators. When the butler mentions his confusion about the identities of the house guests, Poirot realises that the four sons of Simeon's marriage may not be Simeon's only sons present in the home. Poirot finds the uncut diamonds mixed in with the stones of a decorative outdoor garden, which takes theft away as a motive. The family lawyer reads Simeon's will, which leaves half to son Alfred, who runs the business, and the other half to be split among his other children. This leaves Pilar with nothing, as her mother died a year earlier, and his granddaughter is not specifically named. Alfred, David and Harry agree to pool their inheritances and make a share for Pilar. This warm gesture, based on what is just, as Lydia tells her, upsets Pilar, and she refuses it. The final major clue comes from Pilar. She and Stephen are playing with balloons and one bursts; she mentions that the pieces are like what she found on the floor after Simeon Lee was killed. Poirot warns her to be "on her guard", as she knows more than she realises. Soon she is almost killed in another murder attempt, of a stone cannonball perched above her bedroom door.