Craving a true scare on Halloween, sisters Harper and Adeline dare to go trick or treating at the lone house on the bluff. Whispered rumors have it that for those who can make it through the darkness and past the dogs the lady there offers the most unusual treats. When the sisters' bravery is rewarded with a choice, younger Adeline grabs a handful of ordinary candy. But Harper is tempted by mischief. If Harper accepts the more unusual treat, is she prepared for the most unusual consequences?