Elinor settles two thousand pounds on Mary, which Mary accepts. Elinor sells the house she inherited. Mary dies of morphine poisoning at an impromptu lunch at Hunterbury, as Elinor, at the house, and Mary with Nurse Hopkins, at the lodge, are clearing out private possessions. Everyone at the house had access to the morphine Nurse Hopkins claimed to have lost at Hunterbury while Mrs Welman was ill. Elinor is arrested. Later, after the body is exhumed, it is learned that her aunt died of morphine poisoning. Peter Lord, in love with Elinor, brings Poirot into the case. Poirot speaks to everyone in the village. He uncovers a second suspect when Roddy tells him of the anonymous letter - the writer of that letter. Poirot then focuses on a few elements. Was the poison in the sandwiches made by Elinor, which all three ate, or in the tea prepared by Nurse Hopkins and drunk by Mary and Hopkins, but not by Elinor? What is the secret of Mary's birth? Is there any significance in the scratch of a rose thorn on Hopkins's wrist? The denouement is revealed mainly in the court, as the defence lawyer brings witnesses who reveal what Poirot uncovers.