Prince of Swords — Linda Winstead Jones

As the forces of good and evil clash in an epic battle, the firstborn children of the Fyne witches have finally come into their own, each with a special gift that will shape destiny...

For months, Rayne has been imprisoned in the cellar of a secluded house, afraid of the day when the demon- possessed Ciro--the man who has declared himself her future husband--will return to claim her. He believes that the linking of her pure soul to his lost one will produce the perfect child--one who will serve his ultimate purpose.

The Prophecy of the Firstborn spells out that Lyr Hem is to wield the crystal dagger. But his search for it is sidetracked by the beautiful prisoner he encounters. Despite his attraction to Rayne, Lyr is none too happy about taking her along once he has freed her.
Especially when--to foil Ciro's plans--Rayne decides that Lyr is just the man to corrupt her...