Ninth House is a dark fantasy horror novel written by author Leigh Bardugo, published by Flatiron Books in October 2019.

[1] The novel follows unlikely Yale University freshman 20-year-old Galaxy "Alex" Stern, a high school drop out and homicide survivor who can see ghosts, called "Grays".

[4] Bardugo first became inspired upon discovering the tombs of Yale's secret societies as she walked down New Haven's Grove Street during her freshman year.

When her friend sent her pictures from their time at Yale years later, Bardugo was struck with memories, both pleasant and unpleasant, which inspired her to explore trauma for this novel but also companionship through it.

Award-winning horror author Stephen King called Ninth House "the best fantasy novel I've read in years, because it's about real people.