Knight of the Demon Queen

Once the most powerful mage in the land, Jenny Waynest is now a broken woman. She knows a part of her was corrupted by his touch. That part mourns the demon's defeat and longs for his return, though he has already cost her everything she holds dear: the trust of her husband, Lord John Aversin; the chance to be a mother to her mage-born son; and the magic that had given her life its purpose.
Lord John has torments of his own: memories of the beautiful and cruel Aohila, demon queen of a rival hell, whom he'd tricked into providing the help he needed to free Jenny. Now, condemned to death for trafficking with demons, John cannot forgive Jenny for what she suffered. Nor can he forgive himself - for opening the door to a far greater evil.
For a vengeful Aohila needs mortal aid in realms beyond her power and who better to provide it than Lord John? Blackmailed into cooperating, John is given a guide: none other than Amayon, the demon he'd driven out of Jenny and into the waiting claws of the demon queen. Now John must fight his way through unimaginable horrors in quest of a prize that may doom the world he has left behind.
While Jenny, awakened by the stardrake known as Morkeleb the Black, embarks on a quest of her own - one that will lead her, without the magic she has always relied upon, into a world as deadly as any braved by her husband ... only much closer to home.