At the heart of the Hundred Halls, four secret societies have manipulated events for their own dark purposes. They tamper with forbidden magics. They blackmail kings. No corner of the world escapes their reach.

Moriganne must acquire an invite one of these societies or her father will banish her from the family, but her biggest rival stands in her way at every step. When an unexpected death leads to an investigation that implicates the societies, Moriganne must decide what is more important—protecting her siblings and her standing in the family, or finding justice for those she has lost.