A Kiss of Shadows (Meredith Gentry, Bk. 1)

Merry Gentry, princess of the high court of Faerie, is posing as a human in Los Angeles, working as a private investigator specializing in supernatural crime. But now the queen's assassin has been dispatched to fetch her—whether she likes it or not. Suddenly Merry finds herself a pawn in her dreaded aunt's plans. The job that awaits her: enjoy the constant company of the most beautiful immortal men in the world. The reward: the crown—and the opportunity to continue to live. The penalty for failure: death.