A person who had usurped the identity of a famous writer of detective stories was killed in the train. Why and by whom?
Clarisse Coquet
Armand Le Noir
Charles de Bruine
Nazarian
Griset
Avril
Mademoiselle Malvina
Léopold
Pincet
Francis
Philosopher
Le Noir's concierge
Commissioner
Traveler
Lost and Found employee
Organizer
Phyllis
