The clock struck midnight, echoing through the dimly lit mansion. Shadows danced across the walls, whispering secrets of the night. A chilling wind howled, rattling the ancient windows with force. Detective Harper arrived, trench coat flapping, eyes scanning the eerie scene. The butler stood trembling, pointing towards the grand staircase's top. Blood stained the carpet, leading to a door slightly ajar. A scream pierced the silence, sending shivers down spines. Harper approached cautiously, flashlight revealing a lifeless body sprawled inside. The victim's hand clutched a torn piece of crimson fabric. Clues lay scattered, waiting to unravel the night's dark mystery.