Such a frustrating disappointment

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

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

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."