Mortal Heir - The Thief's Talisman, #1

Changeling. Thief. Mortal heir in a world of treacherous immortals. Raine Warren, half-faerie changeling and master thief, wants nothing to do with the family who abandoned her in the human realm as a child. But when Faerie comes knocking, claiming she's descended from Sidhe nobility, she's handed an unexpected legacy. One catch: it comes in the form of a sceptre containing dark power coveted-and feared-by every faerie court, and no instruction manual. Now her name's on every hit list in Faerie, and the other Sidhe will do anything to take her off the playing field...
permanently. Her last hope is to strike a deal with a charming thief with his own agenda and his own plans for the sceptre. On the run from assassins and hunted by the most powerful faeries in both realms, embracing the dangerous magic of Faerie might be Raine's only means of survival.