A middle-aged banker, Theo, and his young actress wife, Susanna, take their six-year-old daughter, Ella, on a vacation to a massive, isolated house in the Welsh countryside, hoping to mend their troubled relationship. However, their stay is marked by nightmares and Theo's growing suspicion that the house harbors a dark and malevolent presence.

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A serene family getaway takes a dark turn as they unravel the mysterious secrets and puzzles hidden within their secluded Welsh retreat.