Instead, you get a movie that's enjoyable enough, but leaves you feeling like it could have been much, much more.

A film with more than the usual spoiler issues. Talking about it in any detail feels akin to handing you a gift-wrapped present and saying, "I hope you like it -- It's a thriller about a diabolical secret experiment."

Strong acting helps the film overcome an uncertain premise and create characters that hold our attention absolutely.

One of the most extraordinary films you will see this year. Take that as you want.