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.
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.
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.
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.
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. As Eliza and Moses work to solve the attempted murder, they realise Eliza was the target.
A famous magician does the ultimate disappearing act and vanishes into thin air. All of London is talking about the mystery and Eliza is hired by a newspaper to investigate, despite the fact that Duke is already on the case.
Eliza bumps into Arabella Herbert, the girl who made her life a misery growing up. But Arabella seems kind and considerate, everybody loves her. So when Eliza suspects she may be a criminal, no one wants to hear it, least of all Duke.
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.
Detective Fitzroy sees one of his colleagues plant evidence on a suspect. With Duke away, Fitzroy turns to Eliza and hires her to look into a case of police corruption.
Eliza is on the verge of earning life-changing money finding the heir to an unclaimed fortune. It's a race to claim the money and Eliza will need Duke's help, but a revelation about his personal life makes working together impossible.
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
Private detective Eliza probes a Lord's vanishing for Scotland Yard. New Inspector thwarts her due to rules against private eyes. Eliza persists clashing with the Inspector while demonstrating her sleuthing skills during the investigation
The chairman of the powerful Guild of Private Detectives turns up dead; Blake finds himself working alongside Eliza whether he likes it or not; Ivy takes on a new opportunity.
A notorious serial killer known as the Thames Reaper is on the loose, and drowns their victims in the murky depths of the Thames; Eliza is caught in the middle of a clash between Fleet Street and Scotland Yard.
After Fitzroy's assault, detectives Blake and Phelps investigate. Eliza, hired by Fitzroy's mother, uncovers a family secret. They aim to stop the Russian secret service's involvement and safeguard Fitzroy.
Eliza and Blake are both investigating the murder of one half of a famous theater team; as their working relationship begins to flourish, their fledgling friendship also blossoms; Eliza may finally prove herself invaluable to Blake.
