The twelvemonth is 1988. Abby and Gretchen have got be best friend since 4th class. After an eve of skinny-dipping travel disastrously incorrect, Gretchen get down to act…different, which lead Abby to surmise her best friend may be possess by a devil. With aid from some improbable allies, Abby embark on a pursuit to salvage Gretchen. But is their friendship powerful plenty to beat out the Satan?