At The Elms School, Poirot speaks first with the headmistress, Miss Emlyn, who sends in the mathematics teacher, Elizabeth Whittaker. While the party-goers were playing snapdragon, she saw Rowena Drake on the first floor landing. Rowena looked startled by what she saw in the open door of the library, and then dropped the glass flower vase she had filled with water. Other suggestive pieces of evidence include Lesley Ferrier's history as a forger. Many thought Lesley and Olga worked together to secure Mrs Llewellyn-Smythe's inheritance.