The title of Netflix’s latest thriller may hint at a grotesque monster lurking in the dark, but it doesn’t take very long for the true monsters to emerge. It’s 1945 in Manchuria, a region of China occupied by Japan, and the imperial army has been hard at work on a series of gruesome human experiments. As enemies close in on a compound hidden in the north, troops are forced to dispose of years of work: papers detailing their studies, as well as the bodies they experimented on. These efforts to protect their secrets are stomach-churning enough on their own — but the leader of this division, the mad scientist General Kato, is hiding something even worse.
