In the heart of London, under the dim streetlights, a chilling scream echoed. The fog was thick, swallowing the city whole, hiding secrets in its depths. A man in a trench coat hurried, his footsteps echoing in the silence. He found a body, cold and lifeless, lying in an alleyway. Blood stained the cobblestones, a stark contrast against the grey. The man looked around, no signs of life, only the fog as witness. He reached for his phone, dialing the familiar number. "Inspector," he said, his voice trembling, "I've found a body." The line went silent, the weight of his words sinking in. He waited, the fog around him growing colder. The game of cat and mouse had just begun, the city now a chessboard.