He is convicted of an unforgivable crime. She has come to commit one of her own.
Tsuran is imprisoned in the Iron Mountain and needs to appease the gods.
Nasna is an assassin who infiltrates the prison to kill a target she's been hunting for decades.
When fate places these two in the same cell, they must tolerate each other in order to not be killed by the other prisoners. But when an accident reveals Nasna's identity to Tsuran, they team together in order to achieve their individual goals.
They must learn to trust each other, if only a little, if they are to overcome hate-filled prisoners, mines ready to collapse, and giant creatures bent on their destruction.
However, they soon find that all of these obstacles are the least of their troubles. Their pasts call to them and they are both forced to make a choice that changes the course of their lives forever.