 Poirot guessed that Sheppard met him that night, knowing that he had gone to the inn where he was staying, and had then hidden him.Poirot further deduced that a doctor would hide someone in a nursing home, hence his questions to Caryl.Ralph's alibi is now useless and Poirot tells the assembled group that to save him the real murderer – who is one of the people in the room – must confess.