In the late 19th century, a young Danish priest travels to a remote part of Iceland to build a church and photograph its people. But the deeper he goes into the unforgiving landscape, the more he strays from his purpose, the mission and morality.

Marcus Chlodwig is a young priest who has just been moved to a new church St Notburga that is set in this small, mysterious town where people are strange and silent. One evening, on the November 4th, he finds an curious old book in a church library about the Satan who lives inside this walls and who appears on the same night for over six decades now. Soon, Marcus finds himself trapped in St Notburga church and his only way to save himself is to stop the Satan.