Mystery of the Blue Train
Characters in Mystery of the Blue Train
9 characters, main characters first.Main characters
Hercule Poirot
The famed Belgian detective who investigates the murder on a luxury train.
Also in The Mysterious Affair at Styles, Murder on the Links, Poirot Investigates, The Murder of Roger Ackroyd, The Big Four, Black Coffee, Peril at End House, Lord Edgware Dies, Murder on the Orient Express, Murder in Three Acts
Supporting characters
Katherine Grey
A composed Englishwoman of about thirty-three who, after years as a paid companion, inherits a fortune and travels south; she speaks with the victim shortly before the murder and becomes Poirot's confidante.
Rufus Van Aldin
Ruth's American millionaire father, who gave her the famous ruby and is determined to see the killer found.
Derek Kettering
Ruth's estranged, debt-ridden husband with a poor reputation; his presence and motives make him an early focus of suspicion.
Comte de la Roche
A smooth supposed aristocrat and Ruth's former lover whose noble title masks humbler and less honest origins.
Mirelle
A temperamental cabaret dancer entangled with Derek Kettering, whose jealousy and shifting testimony complicate the inquiry.
Major Knighton
Van Aldin's affable secretary, drawn into the circle of those connected to the victim and her family.
Ruth Kettering
An American heiress and wife of Derek, whose death sets the mystery in motion.
Minor characters
Heart of Fire
A priceless ruby with a storied history; its theft sits at the center of the case and ties the suspects together.