My Best Friend's Exorcism is a 2016 horror novel by Grady Hendrix that blends 1980s nostalgia, teen angst, and demonic possession into a story about enduring friendship. Set in 1988, the story follows high school sophomores Abby and Gretchen, whose friendship is tested when Gretchen begins to act strangely after a night of skinny-dipping, leading Abby to believe her best friend is possessed. The book is known for its blend of horror and humor, with comparisons to The Exorcist and Heathers, and explores themes of female friendship, self-image, and the challenges of the 1980s.
