Excellent but underrated film

This is a tender, generous movie that likes its characters and presents them as real people, full of flaws and strengths.

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."

The film never slows down or bores, plunging from one harrowing sequence to the next.