The Forgotten is a 2004 American science fiction psychological horror thriller film directed by Joseph Ruben and starring Julianne Moore, Dominic West, Gary Sinise, Alfre Woodard, Linus Roache, and Anthony Edwards. Synopsis: A woman believes that she lost her son in a plane crash 14 months earlier, only to wake up one morning and be told that she never had a son. All of her memories are intact, but with no physical evidence that contradicts the claims of her husband and her psychiatrist, and she sets out in search for solid evidence of her son's existence.

References:
https://en.wikipedia.org/wiki/The_Forgotten_(2004_film)