It's not great by any means, but it's a pretty good movie that didn't leave me filled with regret for investing time in it.

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 a must-see and one of the best documentaries - and films - of this year.

One of the film's great tricks is that, for a time, you think it will go down a rabbit hole of unrealistic glorification.