LAPLACE'S WITCH (2018)
A death occurs at Akakuma Hot Springs in north-eastern Honshu. The deceased is a hotshot film producer, Yoshiro Mizuki, who was a short getaway with his wife, Chisato. In the brief time she was gone from their walk, he succumbed to hydrogen sulphide (H2S) poisoning. A short while later, struggling actor Goro Nasuno also dies from H2S poisoning while staying at Tomate Hot Springs in the Hokuriku region, which lies along the central Sea of Japan coast. It is not unusual for H2S gas to rise through openings in the ground in the vicinity of hot springs, but in neither case did measurements taken immediately afterward show sufficient concentrations of the gas to cause poisoning.