In a quiet New Jersey town, young and sweet Karen Spages prepares for her First Communion, an event overshadowed by her bright but troubled older sister, Alice. On the big day, tragedy strikes when Karen is brutally murdered in the church, leaving the community and her family devastated. Suspicion soon falls on Alice, who has shown signs of jealousy and erratic behavior. Amidst the suspicion and grief, Alice's family starts noticing strange occurrences and eerie signs that lead them to question whether Alice could be capable of such a horrifying act.

As the investigation deepens, more chilling events unravel around Alice, causing tensions to rise within her family and the community. Alice's mother, Catherine, struggles with her own doubts and fears, while Father Tom, a family friend, tries to provide solace. The local police dig into the twisted underbelly of the town's secrets, revealing dark truths and uncovering hidden motives. A sense of dread builds as intertwining paths of deception and horror leave everyone wondering who is truly behind the sinister activities threatening their once peaceful lives.