Our supernatural heroes move to Wales to continue their quest to live like normal human beings and soon realize that it won't be getting any easier... For starters, Annie is trapped in purgatory and fears she will be condemned to Hell until Mitchell crosses into the afterlife to save her. And George and Nina battle with challenges of their own when they conceive a baby while transformed as werewolves. Meanwhile, having committed the Box Tunnel massacre in season 2, Mitchell finds the net closing in on him from this world and the next. And with a prophecy that a werewolf will end his life, Mitchell feels hounded when George and Nina meet more of their kind. Not to mention the fact that old adversary Herrick has risen from the dead and is living in the attic...