The sister of a missing woman hires Eliza to find her, but when the case is closed by the police, new tensions are created between Eliza and the Duke.

A valuable sketch by the late Charles Darwin has been stolen and Eliza is hired by an insurance company to find it, but a twist soon emerges.

A famous mystery writer is at the centre of Eliza's investigation when a series of murders copy scenes in his books. Meanwhile, the Duke is also juggling problems at work with a new superintendent and a troubled young detective.

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.