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?

After Haley goes missing, Michelle must work quickly to find her daughter and discover the truth behind the mysterious deaths before Haley or anyone else gets hurt.