Overview: Teen best friends Abby and Gretchen grapple with an otherworldly demon that takes up residence in Gretchen’s body. The year is 1988. Abby and Gretchen have been best friends since fourth grade. After an evening of skinny-dipping goes disastrously wrong, Gretchen begins to act…different, which leads Abby to suspect her best friend may be possessed by a demon. With help from some unlikely allies, Abby embarks on a quest to save Gretchen. But is their friendship powerful enough to beat the devil?