When Eliza Scarlett's father dies suddenly, she's faced with a stark choice. Accept the fact she is now penniless or take on and run her dad's detective business, but can she succeed against all the odds in this male-dominated world?

As London's only female detective, Eliza is struggling to get work. Desperate for money, she 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 pleaded guilty.

The Duke hires Eliza to spy on suffragettes. Going beyond her instructions, she gets involved in Britain’s biggest plot since Guy Fawkes.

A post-mortem portrait photographer gets messages from beyond the grave. Eliza’s investigation takes her into the spirit world.

Searching for the secret to her father’s fate, Eliza goes to an abandoned prison. Eliza and the Duke stumble on a criminal enterprise.