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."

Excellent and certainly provocative... If nothing else, the film is a real conversation starter.

A film of deceptively outspoken contemporary relevance, this is cinema at its most alert, alarming and alive.

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