My Demon’s Kiss (Bound in Darkness) by Lucy Blue

A valiant warrior... Wearied by the violence of the Crusades, Simon, Knight of Lyan, is returning home to Ireland when he is attacked by a vampire and transformed into a creature of the night. His only chance for redemption is to find an ancient treasure of legend -- the power of which can restore his humanity.

A brilliant beauty... Young Isabel of the Castle Charmot knows that her freedom and the preservation of her family's estate depend not only on her comeliness, but on an intricate deception of her own design. Thus far, her ruse has kept potential enemies and amorous suitors at bay -- until the mysterious visitor appears at her door, asking to explore the catacombs of her keep.

A desperate desire... In each other, Simon and Isabel find the comfort and trust to share their separate secrets -- and a shared passion they never thought possible. But when the sinister creature that cursed Simon to darkness arises once more, the doomed knight must choose between saving his immortal soul and claiming the heart of the only woman he's ever loved.... (from Amazon.com)

Hardcover Info: ISBN 0743464486, Pocket Books