Rain pelted the cobblestones, casting an eerie glow on the deserted street. A shadowy figure scurried, clutching a mysterious package tightly. Suddenly, a piercing scream echoed through the darkness, shattering the silence. Startled, the figure dropped the package, revealing a bloodstained letter. In the distance, a faint siren wailed ominously, signaling approaching danger. Footsteps hurriedly retreated, leaving the ominous note behind. Alone, it lay on the rain-soaked cobblestones, hinting at an unseen tragedy. The stage was set for a chilling murder mystery.