The story opens in the way of so many paperback originals that I can't count them. A man wakes up with no memory of who he is or how he came to be where he is (in a bathtub). He has blood on him, and, sure enough, there's a dead body nearby. And then things get really weird. No one knows what's real and what's not real because The Strangers are implanting people with false memories. Perception and reality are twisted so that it seems as if nobody really knows what's going on.
Nice performances from Rufus Sewell, William Hurt, Kiefer Sutherland, and Jennifer Connelly. Nice visuals, too, in a dark way.
If you like SF/crime mash-ups and you haven't seen this one, you've missed a real treat.