Unsane is a horror film about mental health care. Yes, we’re toying with problematic subject matter here for the horror genre. Somehow, director Steven Soderbergh and writers Jonathan Bernstein and James Greer craft a horror film that doesn’t vilify mental health patients, largely because the main characters in the film are patients at a mental hospital who really don’t belong in that kind of facility. Yes, that itself is a cinematic trope, but it’s handled in a way that at least explains through believable circumstances how the setup happens.