Reverend David Poe and his wife, a psychiatrist, leave the bustling life of New York City behind for a serene farmhouse in the countryside, an ideal setting for their 10-year-old twins, Jack and Emily, to explore and let their imaginations run wild. As part of chronicling this new chapter, David begins recording every holiday and significant family occasion. However, to the Poe family’s dismay, these home videos start to uncover a growing malevolence and wickedness in their children. By Valentine’s Day, the twins’ cruelty escalates into a dangerous thirst for human victims.