London 1882. After the death of her father, young March Middleton comes under the guardianship of her godfather: Sidney Grice, England's most famous detective, who is faced with a new mystery. A woman has been brutally murdered, and the only suspect is her husband. With each new twist in the case, Sidney becomes more convinced of the husband's guilt, while March believes in his innocence. The investigation leads the young woman, who has a penchant for gin, and the gruff skeptic with the glass eye into the darkest corners of the East End. Who will turn out to be right?.