 Between Poirot's appointment and Morley's death, the dentist had three patients - along with Mabelle, he also dealt with Alistair Blunt, a prominent banker, and a Greek spy known only as Amberiotis.A fourth person was present at the surgery, Howard Raikes, an American left-wing activist who disliked Blunt but is enamored with his niece, Jane Olivera.Amberiotis is later found dead from an overdose of anesthetic, leading to the belief that Morley accidentally killed him and committed suicide upon realizing his mistake.