A string of disappearances rocks the coastal city of Wucheng. Journalist Shen Zhiwei receives an anonymous letter bearing a postmark from ten years ago. It accurately names the next person to disappear. She joins forces with Gu Chen, the detective handling the old case, to investigate, only to discover that every clue points to the shipwreck covered up ten years earlier. As the list of missing people continues to grow, old records left by her father and evidence Gu Chen has concealed also come to light. Before the thick fog seals off the city, they must uncover the truth and decide: will revealing it save lives, or turn even more people into sacrifices?
