A carriage bearing the Arnifour family crest brings a new case to Colin Pendragon: Lady Arnifour's husband has been found dead and her niece in a coma. With the police suspecting the groundskeeper and his son, Lady Arnifour believes in their innocence. While investigating, Pendragon and Pruitt are also approached by a street urchin looking for his missing sister. Their search takes them from opium dens to Embassy Row, revealing a connection between the cases that is both unexpected and dangerous.

When a captain and his wife in Her Majesty's Guard are murdered, Colin Pendragon and Ethan Pruitt are called to Buckingham Palace. Major Hampstead demands discretion to protect the Guard's reputation, pushing Pendragon to solve the case swiftly under the threat of a media cover-up. Despite obstacles from Inspector Varcoe, Pendragon and Pruitt work against time to uncover closely guarded secrets and catch the killer, putting Pendragon's integrity on the line.

After the disappearance of wealthy Edmond Connicle, his wife hires Colin Pendragon and Ethan Pruitt for the investigation, which intersects with Inspector Varcoe's suspicion towards the Connicles’ West African maid, especially after a body is found on the estate. As more bodies surface, Varcoe and Pendragon must collaborate, examining if the motive is rooted in Voodoo or if a more mundane madness is driving the killings.

Colin Pendragon and Ethan Pruitt travel to Sussex County on request of Pendragon's father to investigate the murder of a monk at Whitmore Abbey. With the abbott brutally killed, suspicions initially fall outside the monastic community. However, the murder of a local barmaid in a similar manner compels Pendragon and Pruitt to consider all possibilities, including those within the abbey, to solve the interconnected murders before more victims emerge.

In Victorian London, detectives Colin Pendragon and Ethan Pruitt are tasked with investigating whether the death of Adelaide Endicott, the elderly sister of a senior Parliament member, from a fall at Layton Manor was a suicide or murder. Despite Scotland Yard's conclusion of suicide, Adelaide's sister, Eugenia, insists on foul play. The investigative duo delves into Adelaide’s psychological state and potential motives for her death, uncovering a family history filled with scandalous secrets, abuse, and trauma. Evidence points to a sinister presence at Layton Manor, highlighting the need to reveal the truth to prevent further tragedy.

In Victorian London, a young prostitute is found murdered in her flat on Framingham Street in the East End, bearing a striking resemblance to the crimes of Jack the Ripper. With Scotland Yard unable to solve the case and two other prostitutes already killed, detectives Colin Pendragon and Ethan Pruitt are brought in with the hope of ending the killings. As fear spreads across London, Pendragon and Pruitt investigate every lead, from the opium dens of Whitechapel to the London morgue, in search of answers. The pursuit pushes them into the city's darkest corners, confronting a mystery as elusive and dangerous as the Ripper himself.