Olivia and her ex-girlfriend Penny are reuniting for their friend Natasha's Halloween weekend away in Hollowhood. At first Olivia dreams of reigniting the love she and Penny shared, but the creepy locals, the peculiar priest, and a man whose wife went missing five years ago change those plans. Soon Olivia isn't focused on whether she and Penny can fall back in love, she's focused on whether she and Penny can survive.