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 movie's neither hopeful in contrived ways, nor hopeless in different contrived ways. Somehow it manages to be wonderful

The joyful confection is coated in a sparkly gloss, bright enough to gleam from the darkest, most cynical corners.

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