This movie draws you along, and doesn't leave you in your own head trying to figure out what happens next, till near the end. And even then, you are riveted. The ending had a small twist, that was well done, but seemed a little too preachy at the end. I guess some filmmakers and/or story writers feel the need to supply morals in a world that has no basis for them anymore. Nonetheless, the plot devices and its non-linear storytelling blend well together, and make for a big win in my book. The performances were all lights out fantastic from a cast of relative unknowns. This gives you hope for the future of cinema, and dramatic acting in general. Especially in this era of the super hero film. It also seamlessly blends science and medical technology with the paranormal, in a way I haven't seen since "The sixth Sense". More than any other film I have reviewed here (and there have been a few that I have felt unjustly rated) this film's overall low rating is grossly unfair. It blends all the tools of good storytelling and suspense, with great revelations at its climax and ending. Not to mention dialog that leads you where it wants you to go I highly recommend it.