殺人特急

On a bullet train, surgeon Junichi Nakagawa (Takeshi Kaga) poisons Takashi Shishido (Sabu Kawahara), the head of the health insurance agency who was investigating his affair. Furuhata, who happens to be in the same car, asks Nakagawa for his medical expertise in the investigation, but finds his words and actions contradictory.

外科医の中川淳一（鹿賀丈史）は、自分の浮気を調べていた興信所の所長・宍戸隆（河原さぶ）を新幹線内で毒殺する。たまたま乗り合わせた古畑は医者である中川に捜査の協力を頼み、その言動に矛盾を感じる。