Ep. 75: Murder of the Loan Company President Involving Cyanide Poisoning and a Thumb Habit

75

Richard, Oscar, and Michael invite Hyde Finance President Jonathan Hyde to play Mahjong. When he fails to appear, they discover his body poisoned with cyanide. Suspects include employees Morgan Cartwright, Allison Summers, and Jeremy Janus. Investigation reveals poison residue only on the victim's thumb, money, and door handle. Allison prepares tea while the others use the bathroom. Conan identifies bleach in the restroom and incapacitates Richard to expose Allison as the murderer. She exploited Jonathan's habit of licking his thumb by coating the kettle knob with cyanide. She cleaned the evidence with bleach, leaving a trace on her handkerchief. Allison confesses that her friend Kurt committed suicide after being unable to repay a loan from Jonathan.