A stroke of midnight - Laurell K. Hamilton

I am Meredith Gentry, P.I. and Princess Merry, heir to the throne of Fairie. I have departed the safe haven of Los Angeles to face the peril and deception of my first home, the Unseelie court. There, my enemies are many, and my guards may not be able to protect me from the treachery of the unseen foes that will stop at nothing to keep me from the throne.
As for my quest to produce an heir and thereby save myself and all that is faerie from utter destruction - well, I am still trying. As pregnancy becomes ever more urgent, I must leave the protected beds of the Queen's Ravens and lie with other men, men whose designs and allegiances remain in question. And a night of delirious passion will transport me and my new lovers to another place, the mysterious dead gardens - an event that portends great unrest in the forces of magic.
In order to save myself and those I love, I must walk into the very mouth of danger, and visit the Goblins in their lair - as well as the cunning King Taranis himself, who has an astonishing proposal for me. For I alone hold the power to rescue the universe, even if it requires aligning with my greatest and most dangerous of adversaries. But I'm running out of time. . . .