Ironside by Holly Black
in the realm of faerie...
...the time has come for Roiben's coronation. Uneasy in the midst of the malevolent Unseelie Court, pixie Kaye is sure of only one thing her love for Roiben. But when Kaye drunkenly declares herself to Roiben, he sends her on a seemingly impossible quest to find a faerie who can tell a lie.
Miserable and convinced she belongs nowhere, Kaye decides to tell her mother the truth that she is a changeling left in place of the human daughter stolen long ago. Her mother's shock and horror sends Kaye back to the world of Faerie to find her human counterpart and return her to Ironside. But when Kaye returns to the faerie courts, a battle of wits and weapons is being waged over Roiben's throne, and she soon finds herself at the center of it all.
(Barnes and Noble)
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