Gaslighting / Unreliable Narrator

Gaslighting horror takes its name from George Cukor's Gaslight (1944), in which a husband systematically manipulates his wife into believing she is losing her mind. The term has entered common usage as a description of psychological abuse, but in horror cinema it represents something more specific: the systematic destruction of a person's ability to trust their own perception. The audience watches helplessly as the protagonist's reality is dismantled from within.

The unreliable narrator tradition in horror predates the term "gaslighting." The Cabinet of Dr. Caligari (1920) revealed in its final moments that the entire story may have been the fantasy of an asylum inmate — or may not, depending on which frame you trust. This ambiguity about the narrator's reliability became one of horror's most powerful tools. If you cannot trust the person telling the story, you cannot trust anything the story has shown you, and the ground beneath the entire narrative opens up.

The subgenre thrives on a specific kind of cruelty: the audience often sees the manipulation before the protagonist does, creating a dual horror of watching someone be deceived and being unable to intervene. Rosemary's Baby is a gaslighting narrative at its core — Rosemary's husband, her doctor, and her neighbors are all conspiring, and her growing suspicion is repeatedly dismissed as pregnancy hormones. The Invisible Man (2020) updated the concept for the era of domestic abuse awareness, making the gaslit woman's inability to be believed the central horror.

Films like Shutter Island (2010), The Machinist (2004), and A Tale of Two Sisters (2003) deploy the unreliable narrator to create endings that recontextualize everything the audience has seen. The revelation is not a twist for its own sake but a demonstration of the mind's capacity to construct elaborate fictions to protect itself from unbearable truth.