Eliza is hired to solve a case of blackmail in the shady world of Victorian medicine, and finds herself with a new rival-Patrick Nash, the owner of a large private detective agency who wants to hire her or crush her agency.

While Eliza and the Duke struggle around the edges of their relationship, private investigator Nash is shot just as Eliza agrees to work with him.

Eliza tracks down a notorious conman in a remote part of France, but she’s not the only one who wants to claim the reward.

When Eliza receives a bomb in the mail, she teams up with Duke, Moses and her old enemy Patrick Nash to find out who is behind the delivery.

Things are going well for Eliza until a familiar face shows up to question her role at Nash & Sons. Meanwhile, Duke receives an offer that brings their relationship to a crisis point.

Eliza and Nash are still struggling to work together when an explosive case takes them into a cutthroat industry where people will kill to keep their secrets.

Eliza is hired by Scotland Yard to find a missing Lord accused of murdering his maid, but when the new Detective Inspector arrives, he removes Eliza from the case. DI Blake has his own rule about not using private detectives and Eliza now has a fight on her hands to convince the new boss that she is an invaluable resource.