The Edge of Equilibrium

Physics Laboratory No. 13 was always spotless. No stray papers, no coffee rings staining the tabletops, every instrument lined up with precision on its shelf. Alone in that quiet room, Reiji stood studying the long row of thermodynamic equations he'd just finished writing. The sliding door opened, no knock first. "Word is you broke your own record again this week. Locked yourself in here for three days straight." Reiji didn't turn around. He capped his marker with a sharp click and set it back on the marker tray. "I'm testing a hypothesis, Masato. And your detective's intuition is off. It's only day two." Masato chuckled and stepped inside, with his usual easy manner that clashed with the laboratory's rigid order. His jacket was a little rumpled, and he brought the scent of night air in with him. He had two cans of vending-machine coffee in hand. Without asking, Masato pulled a chair up to Reiji's desk and sat. Only someone who'd shared a cafeteria table with Reiji since university could have gotten away with it. He set one can of black coffee, no sugar, exactly how the professor always took it, down on the corner of the desk. Close enough to reach, far enough not to disturb Reiji's stack of papers. It hadn't happened by chance. Small gestures like that came from years of friendship. Even with no case on the table, Masato dropped by often. Sometimes he'd just sit there sorting through his own police reports while Reiji worked through an experiment, the two of them settling into a comfortable silence. Today, though, his sigh carried more weight than usual. "There's a case at the science faculty over at Y University," Masato began, his tone turning serious as he cracked open his own coffee. "The victim was a research assistant. Found dead in his office last night. The room was locked from inside." Reiji crossed to the desk and picked up his coffee. He didn't drink right away, letting its warmth settle into his palm. "Let me guess. The police are calling it a heart attack." "Exactly. No sign of a struggle, no external wounds, and his face looked calm. Peaceful, even." Masato stared at his faint reflection in the polished surface of the desk. "But my gut's telling me something's off. I saw the body before they took it to autopsy. There was an unnatural red tint to the skin, cherry-red. Classic sign of carbon monoxide poisoning." "Carbon monoxide is colorless and odorless," Reiji said flatly, adjusting his silver-rimmed glasses. "If that's true, the question is where the gas came from. The room was locked from inside, so central ventilation is the most likely route in. Or someone deliberately triggered a chemical reaction inside before the victim locked the door." "That's what we're trying to figure out. No gas canisters, no suspicious chemicals anywhere nearby." Masato leaned back and rubbed the bridge of his aching nose. "The real problem is we don't know who saw him last. The hallway cameras were down for repairs, and the victim often met visitors from outside the university." Reiji watched him in silence. Masato looked exhausted, the shadows under his eyes standing out sharply under the lab's bright fluorescent lights. Without quite thinking about it, Reiji reached over and moved a microscope cable dangling off the edge of the desk, tucking it out of the way so it wouldn't snag on his lab coat. The gesture came without effort, a small habit built from years of watching the professor lose all awareness of his surroundings whenever he was deep in thought. "A locked-room murder, using a synthetic gas that leaves no physical trace," Reiji murmured, his voice trailing lower as he turned the details of his friend's story over in his mind. "So, Professor?" Masato asked with a faint smile, resting his chin on one hand, his full attention on the physicist's composed face. "Does this one catch your interest?" Reiji set his coffee down. His face gave nothing away, but there was a sharp glint in his eyes that Masato knew all too well. He let the man stay there, right in the middle of his own perfectly ordered domain, the one anomaly he never minded. "Bring me the building's air circulation plans tomorrow," Reiji said simply, turning back to his whiteboard. "And the full autopsy report. Let's see if your logic holds up against the laws of physics."