For more than two decades, Mrs. Aylwood has been a grieving mother ever since her daughter, Karen, disappeared in the English countryside. The Carstairs family decides to spend their summer at the Aylwood estate, but they soon experience unsettling events. Jan, a member of the family, starts to believe these incidents are connected to Karen’s mysterious disappearance. As Jan investigates the town’s concealed history, she becomes more entangled in the enigma and faces increasing peril, but escaping the Watcher in the Woods may already be beyond reach.