"Ninth House" is a fantasy novel by Leigh Bardugo, set in Yale University. The story follows Alex Stern, a young woman with a troubled past who is given a second chance when she is admitted to Yale. She becomes involved with the secret societies that practice dark magic and must navigate the complexities of these powerful groups. The novel explores themes of privilege, trauma, and the supernatural. Alex is tasked with monitoring the activities of the societies, particularly the Hermetic Order of the Golden Dawn and Skull and Bones, while uncovering a mystery linked to a series of deaths on campus.