The Victorians were obsessed with death and the afterlife - in fact, spiritualism was almost seen as a new religion when it arrived in England from America in the mid-nineteenth century.
There was even a curious custom where people would pay a photographer to capture the image of a relative who had recently passed away.
Eliza finds herself contacted by one such 'Death Photographer', James Henderson, who is receiving bizarre and threatening messages from beyond the grave. Decidedly spooked, he turns to the Scarlet Detective Agency for help.
Immersed in the dark world of the deceased, Eliza's thoughts turn to her own late father, Henry. When she chances upon his old casebook, she starts to questions the events that led up to his death.