Discovery of the Wagon Lit Uniform

The discovery of the Wagon Lit uniform in Hildegarde Schmidt's suitcase is a pivotal moment in the investigation, confirming the existence of an impostor conductor and exposing the elaborate conspiracy behind Ratchett's murder. This single piece of evidence, found during a routine baggage search, unravels the carefully constructed alibis of the passengers and provides the first concrete link between the crime and the orchestrated plot of the Armstrong family avengers.

The Search and the Discovery

During the systematic search of all passengers' luggage, Poirot, M. Bouc, and Dr. Constantine reached the compartment of Hildegarde Schmidt, the German lady's-maid to Princess Dragomiroff. The woman stood ready, her face respectful but unemotional. Poirot took a quick glance through the contents of a small case on the seat, then motioned to the attendant to get down the bigger suitcase from the rack. When asked for the keys, Schmidt replied that it was not locked. Poirot undid the hasps and lifted the lid. On top of the suitcase was a hastily rolled-up brown Wagon Lit uniform. Poirot turned to M. Bouc and said, "You remember what I said? Look here a little moment!"

The Maid's Reaction and Poirot's Explanation

The stolidity of the German woman underwent a sudden change. She cried out, "Ach! That is not mine. I did not put it there. I have never looked in that case since we left Stamboul. Indeed, indeed, it is true!" She looked from one to another of the men pleadingly. Poirot took her gently by the arm and soothed her, saying, "No, no, all is well. We believe you. Do not be agitated. I am sure you did not hide the uniform there as I am sure that you are a good cook." He then explained his theory: the man in the Wagon Lit uniform, after colliding with Schmidt in the corridor, needed to get rid of the incriminating garment. With all compartments full, he slipped into the one belonging to the woman he had just encountered, removed the uniform, and jammed it hurriedly into a suitcase on the rack. Poirot held up the tunic and noted that a button, the third down, was missing. He then slipped his hand into the pocket and took out a conductor's pass-key, used to unlock the doors of the compartments. This key explained how the impostor was able to pass through locked doors, including the communicating door between Ratchett's and Mrs. Hubbard's compartments.

Confirmation of the Conspiracy

The discovery of the uniform was a crucial piece of evidence that confirmed Poirot's emerging theory of a collective conspiracy. It corroborated the testimony of Hildegarde Schmidt, who had described seeing a small, dark man with a womanish voice in Wagon Lit uniform. It also explained the button found in Mrs. Hubbard's compartment, which had been dropped by the impostor. The uniform, along with the pass-key, demonstrated that the murder was not the work of a single outsider but was an inside job, carefully staged by someone with access to the train's equipment. This finding, combined with the subsequent discovery of the scarlet kimono in Poirot's own suitcase, reinforced the idea that the crime was a meticulously planned performance, with each clue and piece of evidence designed to mislead the investigation.

The Uniform's Role in the Final Solution

In his final summation, Poirot revealed that the Wagon Lit uniform was a central prop in the conspirators' original plan. The murder was intended to look like an outside job, with the uniform cast off in a conspicuous place to suggest how the trick had been played. The snow, however, forced a change of plans. The uniform was hastily hidden in Schmidt's suitcase, and the conspirators had to improvise. The discovery of the uniform, therefore, was not just a piece of evidence; it was a crack in the perfect mosaic of the conspiracy, leading Poirot to understand that the crime was the work of a self-appointed jury of twelve, each of whom had a connection to the Armstrong tragedy. The uniform was a tangible link to the elaborate, theatrical nature of the crime, a performance that had been meticulously rehearsed but ultimately undone by the unforeseen snowdrift.