It was claimed that Quentin injected him with strychnine rather than a narcotic. The curry was analysed, showing that it contained a deadly amount of opium, implicating the bodyguard Ah Ling, who had prepared it. Inspector Japp tells Poirot and Hastings that the key was found near the broken door and that the window was unlatched. Japp believes that the victim's face was charred to cover up the identity of the dead man, but Poirot believes the man to be Paynter. Poirot reveals that Doctor Quentin was Number 4, who entered the house and gave Paynter an injection of yellow jasmine rather than strychnine. He locked the door and exited through the window, returning later to put opium in the curry sample, throw Paynter into the fire, and steal a manuscript – the reason for the murder.