The rain hammered fiercely against the windows of the isolated mansion perched atop the jagged cliffs overlooking the restless sea. Inside, Detective Grace Monroe lit a single candle, its flickering flame casting eerie shadows across the ornate, dusty library shelves. Suddenly, a chilling scream shattered the silence, echoing through the dark corridors, sending a shiver crawling down every gathered guest’s spine. The butler stood rigidly by the door, his pale face betraying nothing despite the chaos unraveling around him. Carefully, Grace stepped forward, her sharp eyes scanning the grand room, where the lifeless body of the hostess lay sprawled. A heavy, ancient book lay open nearby, its cryptic symbols stained with fresh, crimson blood, hinting at a sinister secret. Thunder rumbled as the detective whispered, “No one leaves until the murderer is uncovered and justice has finally been served.”