The clock struck midnight as the mansion's grand hall echoed with the sound of a distant, haunting melody playing softly. Detective Harper arrived at the scene, his trench coat flapping in the cold wind, eyes scanning for any suspicious activity. The guests, dressed in their finest attire, whispered nervously, their faces pale under the dim, flickering chandelier lights above them. A scream pierced the air, shattering the uneasy calm, and everyone turned to see the lifeless body on the floor. Blood pooled around the victim, a crimson stain spreading across the marble tiles, as gasps and murmurs filled the room. Harper knelt beside the body, examining the scene with a practiced eye, noting the peculiar arrangement of the surroundings. A single white glove lay nearby, its pristine condition contrasting sharply with the gruesome scene that had just unfolded. The butler, trembling, pointed towards the library, where a shadowy figure had been seen moments before the murder occurred. Harper rose, determination in his eyes, and motioned for the guests to remain calm as he approached the library door. The door creaked open slowly, revealing a darkened room filled with ancient books and the faint scent of old leather.