Possessor (sci-fi/spy-fy film) (a Mark Kermode review).

The man of many movies, Mark Kermode, sits down for the sci-fi film Possessor, set in an alternative reality Earth where Tasya Vos, a corporate assassin, seizes control of other people’s bodies using a brain-implant technology to execute high-profile targets – but then her senses of reality and self begin to errode after repeated hits.