Identity (2003)

Director: James Mangold

Cast: John Cusack as Ed, Ray Liotta as Rhodes, Amanda Peet as Paris, John Hawkes as Larry, Alfred Molina as Dr. Malick, Clea DuVall as Ginny, John C. McGinley as George York, William Lee Scott as Lou, Jake Busey as Robert Maine, Pruitt Taylor Vince as Malcolm Rivers, Rebecca De Mornay as Caroline Suzanne (as Rebecca DeMornay), Carmen Argenziano as Defense Lawyer, Marshall Bell as District Attorney, Leila Kenzle as Alice York, Matt Letscher as Assistant District Attorney

I've never before seen a film that made me sit on the edge of my seat
practically from the opening credits. And I never got to sit back.

This was a psychological thriller of the best type. There is plenty of
opportunity for you to nominate the "bad guy" and while you may be
right in a sense you will probably also be wrong. The ending is a real
shocker - and I suspect that the typical reaction of many viewers is to
say "No way" - but if you think about it, it is the only possible
ending. But you have to think about it - and the film is so
action-filled that you never have time. SO the realization must come
after the closing credits roll.

I'd never seen John Cusack in anything but a comedy before (except for
a film called "Max", but I saw that before I knew who Cusack was). He
pulled off drama equally as well as he does comedy. An impressive
talent.

And an impressive film.