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. As Eliza and Moses work to solve the attempted murder, they realise Eliza was the target.
Eliza pieces the puzzle together to find out what really happened to her father. Moses has lots of criminal connections, which make him a suspect during the investigation, but it could turn out to be someone who has been under Duke's nose.
The season comes to an explosive climax when Eliza receives a bomb in the morning post. Who sent it and why? Eliza teams up with Duke, Moses and her old enemy Patrick Nash to find out who is behind the deadly delivery
Things are going well for Eliza until a familiar face shows up to question her role at Nash and Sons. Meanwhile, Duke receives an offer that brings their relationship to a crisis point.
Eliza is on the trail of a notorious conman and tracks him down to a hotel in a remote part of France. She believes she has finally caught Scotland Yard's most wanted man, but she's not the only hotel guest who wants to claim the reward.
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.
Eliza is forced into hiding when she is the prime suspect in a series of break-ins at city mortuaries. While Duke tries to find other suspects, Eliza turns to Moses for help.