I gave this film a 9 out of 10, because it was exactly what I expected it to be.

Tells a fascinating and unsettling true story, and does so well, without pretending to have all the answers.

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."

This is one of the best movies I’ve seen in a very long time. You have to go and see this on the big screen.