That Demon Within (2014) movie poster

That Demon Within

魔警

2014 ·1h 52m · ★ 5.6 (78)

By a strange twist of fate, dutiful Hong Kong policeman Dan saves the life of the leader of a violent gang of armed robbers. When they commit another crime, Dan is determined to put an end to their activities. He works with the leader, whom the gang had betrayed, to engineer a plan to wreak havoc within the gang and let the gangsters kill one another. But it becomes increasingly obvious to Dan and to his colleagues that Dan is suffering from a severe mental disorder, and Dan finds that instead of upholding the law as a righteous police officer, he has now become a fugitive wanted for murder.

Why it matters

A gritty psychological crime-horror hybrid that uses Hong Kong’s neon-lit underworld as a backdrop for a descent into fractured identity and moral ambiguity.

  • Tony Leung Ka-fai delivers a powerhouse performance anchoring the film’s tense, unstable atmosphere.
  • Blends noir crime thriller with horror’s exploration of madness and possession — a rare fusion in Asian genre cinema.
  • Practical effects and tight editing underscore the protagonist’s unraveling mind without relying on cheap jump scares.
  • For fans of character-driven horror that probes the fine line between justice and vengeance amid urban decay.
2 horror films in catalog

Horror DNA

Gore
28
Slow Burn
50
Psychological
86
Supernatural
0
Creature
0
Disturbing
50
Fun Factor
17
Cerebral
57
Survival
33

Content Warnings

Dehumanization

Pairs Well With