Fae Promise

The Unseelie and Seelie Courts are at War, and the pawn that could topple them both is her, a fairy godmother.
After finding two dead fae on her way back from Farrington, Martha, a lady of leisure, seeks out the help of witches to aid her. But in the Kingdom, all magic is illegal. 
Through a twist of fate, caught in the act, Martha is dragged before the Court to receive punishment for breaking fae law. But the choice is not one she'd ever imagined: to lose her magic forever or to become a spy for the Unseelie Court. 
The court of her beloved Fae King.