Pierre is a veteran French conductor for the Compagnie Internationale des Wagons-Lits, working on the Paris-Calais car of the Orient Express. The investigators see Pierre as a dependable, honorable man, but not as one “remarkable for brains.” Thus, he appears to be incapable of deception, much less murder. However, suspicion falls on Pierre when a button from a Wagons-Lit uniform is found in Ratchett’s compartment. He’s connected to the Armstrong case through his daughter, a nursemaid for Daisy Armstrong, who later committed suicide after the police scrutinized her for Daisy’s kidnapping.