There is a war raging unseen for the souls of children. In the frozen north, children link hands in a ritual circle and sing a song they never learned to summon a primordial enemy they never knew existed.
The only man who knows the truth, an Inquisitorial agent called Hunter, must track the creature through the vastness of the tundra, through the dangers of the Christmas Forest, to the gates of the citadel of the Red Saint himself.
He's just a fairytale, they say.
They are wrong.