Plagued by horrific banshee nightmares, disillusioned schoolteacher Sean Flanagan journeys to Cearn, an ancient Irish manor steeped in banshee legends. But what begins as a search for answers soon becomes a waking nightmare when distant relatives arrive to contest ownership of the haunted estate, recently inherited by an iconic rock legend. Their arrival-three generations of the family under one roof-awakens the banshee. The manor seals itself, trapping them inside as violent deaths begin. One by one, they fall, with only the chosen victim able to see or hear the creature. As the horrors escalate, Flanagan must uncover the dark truth behind the banshee and its chilling connection to his own childhood.