The city of Verdon was always cloaked in a thick, suffocating fog. Its cold, damp streets were rarely seen by the light of day. Detective Ethan Cross knew this place well, having solved many cases in the shadows of its alleys. But when the body of a young woman was discovered near the riverbank, something felt different. She was the fourth victim in the past month, each case linked by an eerie mark on their wrists—a strange symbol no one could decipher.