Kushiel's Dart

The land of Terre d'Ange is a place of unsurpassing beauty and grace. It is said that angels found the land and saw it was good... and the ensuing race that rose from the seed of angels and men live by one simple rule: Love as thou wilt.

Phèdre nó Delaunay is a young woman who was born with a scarlet mote in her left eye. Sold into indentured servitude as a child, her bond is purchased by Anafiel Delaunay, a nobleman with very a special mission... and the first one to recognize who and what she is: one pricked by Kushiel's Dart, chosen to forever experience pain and pleasure as one.

Phèdre is trained equally in the courtly arts and the talents of the bedchamber, but, above all, the ability to observe, remember, and analyze. Almost as talented a spy as she is courtesan, Phèdre stumbles upon a plot that threatens the very foundations of her homeland. Treachery sets her on her path; love and honor goad her further. And in the doing, it will take her to the edge of despair... and beyond. Hateful friend, loving enemy, beloved assassin; they can all wear the same glittering mask in this world, and Phèdre will get but one chance to save all that she holds dear.

Synopsis from Open Library.