# I Expect the Assassin This Evening explained — The Mystery of the Yellow Room > Chapter companion for The Mystery of the Yellow Room by Gaston Leroux. ## What happens Rouletabille reveals to Sainclair that he has a theory about how the murderer escaped from the Yellow Room without an accomplice, but he cannot disclose it until he is certain of the murderer's identity. He shows Sainclair around the château, pointing out key locations, including Mademoiselle Stangerson's window. In his room, Rouletabille discovers a pair of eyeglasses that deeply unsettle him, hinting at a monstrous mathematical possibility. A concierge delivers a cryptic message, and Rouletabille declares that he expects the murderer to come that evening, though he refuses to name him yet. He criticizes Frédéric Larsan's methods and expresses concern that Robert Darzac may be arrested soon. ## Themes in this chapter ### Reason vs. Intuition Rouletabille contrasts his mathematical reasoning with Larsan's ability-based methods, emphasizing the tension between logical deduction and intuitive leaps. ### Secrecy and Silence The chapter is filled with hushed conversations, cryptic messages, and Rouletabille's refusal to reveal his theory, underscoring the pervasive secrecy. ### Fear and Paranoia The desolate atmosphere, the Green Man's odd behavior, and Rouletabille's terror upon finding the eyeglasses create a mood of dread and suspicion. ## Character check-ins ### Joseph Rouletabille Explains his theory about the Yellow Room crime, shows Sainclair around the château, discovers eyeglasses that disturb him, and declares he expects the murderer that evening. ### Sainclair Accompanies Rouletabille on a tour of the château and learns about the strange phenomenon and Rouletabille's expectations. ### Frédéric Larsan Mentioned as having gone to Paris to pursue Darzac; Rouletabille criticizes his reasoning abilities. ### Monsieur Robert Darzac Expected to be arrested soon; his absences coincide with the murderer's visits, increasing suspicion against him. ### The Green Man Seen near the donjon; described as an odd, uncommunicative figure who lives like a bear and is paying attention to Madame Mathieu. ### Madame Bernier The concierge who visits Rouletabille's room with a cryptic message about the grove of the parquet. ## Key lines > I myself believe that I have discovered what everybody else is searching for, namely, how the murderer escaped from The Yellow Room, without any accomplice, and without Mademoiselle Stangerson having had anything to do with it. Rouletabille claims to have solved the mystery of the murderer's escape from the Yellow Room, asserting it was done without an accomplice or Mademoiselle Stangerson's involvement. _Rouletabille reveals his confidence in his theory but withholds details until he is certain of the murderer's identity._ > I expect that Monsieur Darzac will be arrested in the course of the next week. Rouletabille predicts that Robert Darzac will be taken into custody within the coming week. _This prediction underscores the mounting evidence against Darzac and Rouletabille's concern about the direction of the investigation._ > If the thing is mathematically possible, why should it not be humanly!—And if it is humanly possible, the matter is simply awful. Rouletabille grapples with the horrifying implication that a mathematically possible scenario might be humanly realizable, making the situation dreadful. _His reaction to the eyeglasses reveals a deep inner conflict between logical possibility and moral horror._ ## Links - HTML: https://www.betterreads.online/discover/the_mystery_of_the_yellow_room_se/chapters/xiv-i-expect-the-assassin-this-evening - Book: https://www.betterreads.online/discover/the_mystery_of_the_yellow_room_se - All chapters: https://www.betterreads.online/discover/the_mystery_of_the_yellow_room_se/chapters