A young girl named Sally moves to Rhode Island to live with her father Alex and his girlfriend Kim in a large, old mansion they are renovating. Feeling lonely and neglected, Sally begins exploring the house and discovers a hidden basement with a sealed fireplace. Despite warnings, she unlocks it and unwittingly releases malevolent, ancient creatures that were trapped inside. These terrifying beings, once dormant, start haunting Sally, whispering to her and manipulating her surroundings. As the creatures' influence grows, Sally tries desperately to convince Alex and Kim that something is terribly wrong in the house.

However, her claims are initially dismissed, as Alex and Kim focus more on their renovation goals than her fears. Gradually, Kim starts noticing strange occurrences and grows more concerned for Sally's well-being. As the danger intensifies, the family must uncover the history of the house and the nature of the creatures tormenting them. What began as a quest for restoration quickly turns into a fight for survival, as the creatures' sinister intentions become increasingly clear, and their grip on reality threatens to consume them all.