Flightplan (2005)
This thriller in an airplane had us gripped from nearly the beginning.
Jodie Foster plays a recently widowed woman who's returning to America from Germany with her child and the casket containing her husband. During the flight, she falls asleep and loses her child. Twists and turns ensue.
Jodie plays her character well, although some of the early scenes that are supposed to set up her compromised mental state just confused us with what seemed to be a blend of flashbacks and current timelines. She's waiting for a train alone, then her husband takes her hand, then they're in the morgue where she has to identify his body, then they're walking in the park, then she's standing alone... It didn't track until much later that we were supposed to gather that she was injecting her husband into the events she was experiencing.
Later in the movie, when confronted with no mention of her daughter on the manifest, and no recollection of her presence by any other passengers, do we start to understand that there was supposed to be some doubt of her state of mind in those opening scenes.
Foster's character stays true throughout the film, correctly wavering with doubt, but staying focused on what she believes is reality. The other characters also stick to their parts well, some flitting in and out with appropriate meaning.
It's a Hollywood film, so the bad guy gets it in the end, and everything works out for our heroine, too. Hope that doesn't spoil it for you.
Watch the film; it's a good little drama mystery.