Jack Nightingale fights his battles in the shadows – in the grey areas where the real world meets the supernatural. But when he arrives in San Francisco to take on a group of Satanists bent on opening a doorway to Hell, the danger is out in the open and all too real. The Apostles – a Satanic coven using murder and torture to pave the way for a demon to enter the real world – realise that Nightingale is on their tail. And unleash their own brand of monsters to take him down. With Nightingale's life – and his very soul – on the line, he has only days to stop The Apostles from bringing death and destruction to the entire world.