The Invasion of Carol Enders

A young woman named Carol Enders finds herself in a nightmarish situation after undergoing experimental treatment to cure her anxieties. The procedure has unforeseen and terrifying side effects, blurring the lines between reality and hallucination. As her mental state deteriorates, those around her struggle to understand or help, trapped in the unfolding horror.

This film is a lesser-known entry in 1970s psychological thrillers, often noted for its unsettling atmosphere and Bisset's performance, though some critics found its narrative disjointed and its themes underdeveloped. It did not achieve widespread critical acclaim upon release.

• Praised for its chilling psychological suspense and Jacqueline Bisset's compelling performance.

• Criticized for a confusing plot and an anticlimactic resolution.

• The film's disturbing imagery and exploration of mental anguish are memorable.

Google audience: Audience reception for this film is scarce, but available comments often point to its effectiveness as a disturbing thriller with a strong lead performance, while some find the story hard to follow.

The film was released in the UK as 'The Spiral Staircase' in some territories, causing confusion with the earlier Hollywood film of the same name.