What Lies Beneath is a 2000 American supernatural horror thriller film directed by Robert Zemeckis and starring Harrison Ford and Michelle Pfeiffer, with supporting performances from Diana Scarwid, Miranda Otto, James Remar, Joe Morton, and Amber Valletta. Its plot focuses on a woman who comes to suspect that the lakeside Vermont home she shares with her husband is haunted by a female ghost.
The original story for What Lies Beneath was written by Sarah Kernochan, inspired by a real paranormal experience she had. The project began development around 1998, with Clark Gregg making several alterations to Kernochan's original treatment, which he eventually developed into a feature-length screenplay. Principal photography took place on location in Vermont and on soundstages in Los Angeles, while director Zemeckis was taking a hiatus from filming his concurrent project, Cast Away (2000). It was the first film produced by Zemeckis' production company ImageMovers.