The 12 months is 1988. Abby and Gretchen have been greatest pals since fourth grade. After a night of skinny-dipping goes disastrously incorrect, Gretchen begins to behave…totally different, which leads Abby to suspect her greatest pal could also be possessed by a demon. With assist from some unlikely allies, Abby embarks on a quest to avoid wasting Gretchen. However is their friendship highly effective sufficient to beat the satan?