Identity (2003) is a mind-bending psychological thriller and mystery horror hybrid set at an isolated Nevada motel, where ten strangers are killed off one by one during a storm. With echoes of Agatha Christie’s And Then There Were None, it blends whodunit intrigue, psychological breakdown, and slasher-style horror into a twist-driven thriller.

Från IMDB:
Stranded at a desolate Nevada motel during a nasty rain storm, ten strangers become acquainted with each other when they realize that they're being killed off one by one.