Mrs. Hubbard quickly comes to her interview and says that she possesses extremely important information regarding the murder. She communicates to Poirot that the murderer was actually in her compartment. The evening before, she had gone to sleep, but she was suddenly woken up in the night and became aware that a man was in her compartment. Mrs. Hubbard had been in bed, with her eyes firmly shut and rang the bell for the conductor. When the conductor finally arrived, there wasn’t anyone within her compartment. Mrs. Hubbard told Poirot that she had requested that the conductor make certain that the communicating door between her compartment and Ratchett’s compartment was properly bolted. For additional safety, a suitcase was placed before the door, as well. Mrs. Hubbard was unsure of the time at which all this happened. Additionally, the lady provides Poirot with some evidence: a button she discovered on the floor of her compartment. This button is identical to that of the Wagon Lit conductor. Poirot inquires of Mrs. Hubbard whether she has ever heard of the Armstrong case. Mrs. Hubbard informs Poirot that she did not have any intimate acquaintance with the family, but she has strong feelings about the case and is upset about the fact that the murderer got away with it. She reacts excitedly when Poirot informs her that Ratchett is Cassetti, the murderer. Poirot also discovers that Mrs. Hubbard doesn’t own a scarlet nightgown, and never had the handkerchief found on the floor in Ratchett’s compartment.
Greta Ohlsson is the next person who is questioned. Greta is believed to be the person to last see Cassetti (Ratchett) alive. She mistakenly opened the door, believing that it was Mrs. Hubbard’s. Ratchett was within, reading. Prior to leaving Mrs. Hubbard’s compartment, Gretta is asked to ensure that the communicating door was bolted. After this, at around 10:55, she went back to her own compartment to sleep. Greta and Mary Debenham share a compartment. Greta did not witness Mary leaving the room all night. Greta does not own a red dressing gown. She did not have knowledge of the Armstrong case, but was very upset to learn about the kidnapping.
Pierre Michel is soon brought in to see about the conductor’s uniform button that Mrs. Hubbard discovered in her compartment after the murder took place. M. Bouc inquires whether Michel has information of any kind, but he doesn’t have any. His buttons are all where they should be. He is angry at the idea that they believe that he might be suspect, and he summons his colleague from the other car so that his alibi can be corroborated. The colleague immediately confirms that his story is true. The conductor is sent away, and Princess Dragomiroff is brought in for questioning. The Princess tells Poirot that the previous night she went to bed immediately after dinner and then read until 11 p.m. At approximately 12:45, she range to summon her maid, Hildegarde Schmidt, who gave her a massage and read aloud to her until she felt she could sleep. She didn’t hear anything unusual during this time. The Princess indicates that she was a close friend to the Armstrongs. Sonia, their daughter, was her goddaughter. She also informs Poirot that there is a younger Armstrong daughter, but that the Princess is no longer in touch with her. The Princess owns a black satin dressing gown. The Princess asks Poirot for his name. When he informs her of his name, she responds, "Yes. I remember now. This is Destiny."