Amy Mustafi, a high-flying big city lawyer, moves into a British countryside estate which has just been purchased by her wealthy husband Shayan Mustafi. Due to her Bipolar Disorder, Amy has recently been put on gardening leave from her job following a manic episode in the work place. As she sets up her dream home, she finds a sealed off door down to the estate's servants' quarters. With the help of two mysterious housekeepers hired by her husband, Amy opens the door. Soon, she begins to experience strange supernatural occurrences, which begin to incite her fragile mental stability. Are these a result of the home's dark past or of Amy's fractured psyche?