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Possession, a 1981 psychological horror film, marked the triumph of Isabelle Adjani's acting career. Her portrayal of Anna/Helen, a woman grappling with a dual personality and possession, earned her the prestigious César Award for Best Actress. Adjani's nuanced performance, capturing the character's inner turmoil and psychological complexities, showcased her exceptional talent and cemented her status as one of the most acclaimed actresses of her generation.