London, spring 1849. Charles Dickens, the famous author, turns detective. He and Superintendent Jones of Bow Street must find the man who cut the throat of Patience Brooke, assistant matron at Urania Cottage, Dickens's home for fallen women - a man who sings as he kills. Their search takes them into the filthy slums of the Victorian capital where the fog hides grim secrets. When a little girl is found dead and another girl disappears from the Home, Dickens is forced to face deeply buried secrets from his own past in a race against time to prevent another murder.