"Lady Midnight" is a young adult fantasy novel written by Cassandra Clare. It is the first book in the Dark Artifices series, set in the same universe as her previous works, including the Mortal Instruments series. The story follows Emma Carstairs, a skilled Shadowhunter, as she investigates a series of mysterious murders in the Los Angeles area. The novel explores themes of love, friendship, and the struggle against dark forces. Emma, along with her parabatai Julian Blackthorn, navigates complex relationships and the challenges of their world, all while uncovering secrets that could change everything for the Shadowhunters.