Simple and well acted, it has tension enough to knot the stomach.

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 storyline feels a little thin and moth-eaten in parts but this sequel is plenty of fun.

It is encouraging that the film ends so strongly.Otherwise, it wouldn't have been a particularly memorable film