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A psychodrama set amid funeral parlors, graveyards and creepy old tenement buildings, “That Demon Within” owes as much to Hong Kong’s vintage horror genre as it does to the strong noir style of Dante Lam’s superior cop thrillers “The Beast Stalker” and “The Stool Pigeon.” Working from a real-life criminal case but steeping it in ghoulish Chinese supernatural lore, the action auteur turns a policeman’s battle with a Jekyll-and-Hyde personality into an exploration of the evil instinct latent in everyone. The result is Lam’s darkest work to date, one where violence is not just graphic but ugly, and Hong Kong symbolically comes to resemble a charnel house. It should do gangbusters biz in Asian-friendly genre markets, though mainstream domestic audiences may not embrace the grim content as readily as they did his heartwarming 2013 hit, “Unbeatable.”
