He poisoned the cocktail jug, not the dinner, and added arsenic to the sample of curry he took before he gave it in for testing. He added a second dose of arsenic to Alfred's tea. He sent the poisoned tablets to Harold. Miss Marple then tells Mrs McGillicuddy and Inspector Craddock that Luther Crackenthorpe may die soon, that Emma will get over the doctor, and that there will be wedding bells for Lucy – though she refuses to be drawn on the identity of the groom. It is obvious to Miss Marple.