Mark, a low end South London hitman recently released from prison, tries to go straight for his daughter, but gets drawn back in by Alan, his former cellmate, to do one final job.
It's the day after the events of the first film and Sally Burns and her friends are preparing for a Halloween party. As the evening of fun kicks off, unbeknownst to them, The Plague Doctor and The Creature are preparing to join them.
A gruesome discovery in the grounds of their new home plunges a young couple into a maelstrom of spiritual possession, pagan rituals, Viking battles, and violent revenge.
