In the quiet of a rainy night, Detective Hart entered the old library. A chilling scream had echoed through the darkened halls. The librarian, pale and trembling, pointed towards the rare books section. A lifeless body lay sprawled amidst the dusty tomes. The victim's eyes, wide and unseeing, stared at the ceiling. A single gunshot wound marked the victim's temple. Beside the body, a cryptic note lay folded in half. "The raven flies at midnight," it read in blood-red ink. The detective's brow furrowed, a sense of dread settling in.