Director Robert Zemeckis’ 2000 ghost movie What Lies Beneath has several layers to its mystery, but here’s why Claire was being haunted. What Lies Beneath has oddly faded a bit from the popular consciousness in recent years, despite being directed by one of the most decorated filmmakers in Hollywood, and starring two hall of fame-caliber A-list actors in its leading roles. While reviews from critics were mixed, What Lies Beneath was a big box office success, nearly tripling its $100 million budget worldwide.
https://screenrant.com/what-lies-beneath-movie-ending-explained-ghost-claire/