A famous author receives a mysterious, frightening letter that goes unread. The letter warns the writer of imminent danger, casts a dark, sinister shadow. It's signed, "The Shadow Cord." The recipient feels unease settle deep within their heart as they read. Intrigued yet terrified, they decide to investigate the sender's identity. As they sift through the literature room searching, a sudden, dreadful noise startles them. A precious manuscript, a masterpiece, is missing, sparking fear and disbelief. The author instantly realizes someone knew about the item's existence. Whoever the murderer is clever, has to be meticulous and cunning. With suspicion on themselves but just an author, their world starts to tilt. They must figure out who among their circle harbors this dangerous secret.