The group of travelers includes a young couple, their friends, and a hitchhiker they picked up on the way. As they seek refuge from a relentless storm, they realize that the jail is not only abandoned but also haunted by the vengeful spirit of Sister Monday.
As they explore the jail, they start experiencing supernatural occurrences and uncover dark secrets about the nun's past, including her brutal treatment of prisoners and her involvement in a ritualistic murder. The group soon realizes that they are not alone in the jail and that the nun's curse is very real.
They try to escape, but the nun's spirit won't let them leave as she seeks revenge for the injustice done to her. The travelers must band together and fight to survive the night while unraveling the mystery of Sister Monday's curse.
As the night wears on, the travelers become increasingly desperate and terrified, and it becomes clear that only one of them will make it out alive. A Nun's Curse is a chilling tale of horror, revenge, and redemption that will keep viewers on the edge of their seats until the very end.