It's fun, it's light, [but] it has a hard time when its tries to get heavy.

The performances transcend the film's tropes, grounding it in characters that feel more complete than this subgenre often produces.

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."