This film, Before I Go to Sleep, is a thriller version of 50 First Dates: Christine (Kidman) has amnesia and can't remember her husband (Firth), who has to remind her of who he is every single day. Meanwhile, she visits her doctor who is prodding her memory. The mystery is finding out which man is manipulating her and lying to her about crucial facts.
“There are very few psychological thrillers, particularly for women, that play just on your face and the psychology of the character, with very little dialogue" - Kidman
source: wallstreetjournal for more from kidman - rewritten by me