Andrzej Żuławski's 1981 psychological horror film 'Possession' stands as one of cinema's most unsettling explorations of marital collapse and metaphysical terror. Set against the backdrop of divided Berlin, the film follows Mark (Sam Neill), who returns from a prolonged absence to find his wife Anna (Isabelle Adjani) demanding a divorce. What begins as a drama of infidelity and custody battles descends into a surreal nightmare as Anna's increasingly erratic behavior suggests something far more sinister than mere adultery.

Isabelle Adjani delivers a legendary, Cannes-winning performance that remains one of horror's most physically and emotionally demanding portrayals. Her transformation from troubled wife to something entirely otherworldly is matched by Sam Neill's descent into paranoid obsession. Żuławski's direction creates a palpable atmosphere of urban alienation and psychological disintegration, using the Berlin Wall as both literal setting and powerful metaphor for emotional barriers.

Viewers should watch 'Possession' for its uncompromising vision that blends body horror with profound philosophical inquiry into identity, commitment, and the monstrous aspects of human relationships. The film's practical effects remain disturbing decades later, while its ambiguous narrative continues to provoke debate. More than just a horror movie, it's a devastating portrait of a marriage's supernatural dissolution that will haunt viewers long after watching. The Criterion Collection restoration makes this cult classic more accessible than ever for new audiences discovering its unique power.