Poirot goes to Count and Countess Andrenyi and informs the Countess that he’s aware of her true identity: Helena Goldenberg, sister of Mrs. Armstrong. The Count immediately falls into denial of this accusation, but Helena eventually confesses. She explains that she attempted to conceal her identity because she was the one of all the passengers with the most motive to kill Ratchett, as she was closely connected to the Armstrong family. Ratchett murdered her niece, as well as her sister, and he devastated her brother-in-law’s life. Helena declares that she has never tried to hurt Ratchett, and that she never deserted her compartment. The handkerchief discovered in Ratchett’s compartment does not belong to her, even though there is an “H” on it. Poirot questions the Countess with regard to the Armstrong case, especially about Suzanne’s death. Suzanne was Daisy’s nursery maid. Helena is unable to remember Suzanne’s surname, but knows that she was a Frenchwoman. Suzanne killed herself because she believed that she was under suspicion. Poirot asks Helena questions about Daisy’s nurse. Helena informs Poirot that she had the name of Stengleberg, and that she was a trained hospital nurse. Helena herself had Miss Freebody, described as a dragon and a secretary to Sonia. Miss Freebody was “English—or rather Scotch, a bit red-haired woman.” With the exception of Princess Dragomiroff, Helena hasn’t recognized any individual on the train.
After she has heard the Countess Andrenyi speak, M. Bouc feels sure that she is guilty. Poirot, however, isn’t certain of this. He believes that the Count could be telling the truth, and that the Countess might well be innocent. Princess Dragomiroff comes into the car and comes directly over to Poirot, “I believe, Monsieur…that you have a handkerchief of mine.” Poirot is triumphant when handing the handkerchief to the Princess, as his assumptions were correct. The Princess says that the “H” present on the handkerchief is actually the Russian character “N.” The Princess has no explanation as to how the cloth ended up in the room of the murdered man. She declares that she is telling the truth, in spite of the reality that she hid the identity of the Countess Andrenyi. The doctor gives Poirot his assurances that the Princess couldn’t possibly have killed Ratchett. He says, “never, never could anyone with so frail a physique inflict” the wounds. Poirot recalls something the Princess said while being interviewed. She had said that her arm that had more strength than her will. She looked down at her arms after saying this. M. Bouc is surprised by the number of lies the passengers have told both him and Poirot. Poirot has a cheerful countenance as he declares, “there are still more to discover.”
Colonel Arbuthnot is asked to come for a second interview. He sits down, and Poirot immediately questions him about the pipe cleaners that were discovered in Ratchett’s compartment. Arbuthnot declares that he did not drop them there, and that he had never even spoken to Ratchett. Poirot asks whether even though he had never spoken to him, he could have murdered him. Arbuthnot says that he did not. Poirot asks again about what Mary meant by what she said at the Koya station: “Not now. When it’s all over. When it’s behind us.” Arbuthnot will not tell him the meaning.