Grace Carter, a “source” of magic, has spent the last nine months searching for Maggie Mulvaney, her “catalyst”. The joy of reuniting with her partner—and her love—is thwarted by her worst fear: Maggie doesn't remember Grace or their life together. Grace blames the Order of Saint Teresa, the centuries-old organization that trained them to be the strongest demon-hunting duo in generations. But why has the Order done this?
As Maggie and Grace begin to piece their lives back together, they discover that their memories have been masked by someone within the Order, a demon who has been running their realm since Saint Teresa defeated the demon lord Ammemnion. Should the demon succeed in reviving Ammemnion, those in the Order who have committed their lives to slay worldly demons will be relegated to little more than minions as he enslaves humans completely.
Now, Grace and Maggie must sacrifice everything, possibly even their lives, as they take on the demon lord in an all-out battle to save humanity.
