Eliza Scarlet goes to work as a private detective to get out of debt. Luckily, a family friend known as the Duke is a cop willing to help.

Eliza takes a seemingly impossible case: proving the innocence of a man found at a murder scene with a bloodied knife in his hand, who has already pleaded guilty.

Scotland Yard has its eye on potentially disruptive gangs and political groups. Eliza is hired by The Duke to go undercover and infiltrate one such group.

Eliza is hired by a Death Photographer who is receiving bizarre and threatening messages from beyond the grave, and later makes a surprising discovery about her late father.

The final entry in Henry Scarlet's casebook takes Eliza and Duke to a seemingly abandoned prison on the outskirts of London.

Forgery, murder, and false accusation strain Eliza's forensic skills as she gets to the bottom of her father's death, aided by the Duke and her underworld friend Moses.