As children, Lacey and her younger brother, Willy, witness their mother's sexually charged and abusive relationship with her boyfriend. One night, traumatized by another violent episode, they retaliate in fear and desperation. They murder the boyfriend, not fully comprehending the consequences of their actions, and seal away their gruesome secret, hoping to leave the past behind them. However, as they grow up, the traumatic events of their childhood continue to haunt them, particularly manifesting through Willy's disturbed mental state.

Years later, Lacey is now a grown woman attempting to live a normal life with her husband, Jake, and her son. However, the past refuses to stay buried. After a visit with a psychic leads to a bizarre and terrifying incident, an invisible and malevolent force is unleashed. This sinister presence begins wreaking havoc on Lacey's life, putting her and those she loves in grave danger. As bizarre and violent occurrences intensify, it becomes clear that the murder from their childhood has spawned something unspeakable that will not rest until it has completed its macabre mission.