A young girl is destined to liberate her world from the grip of the Magisterium which represses people's ties to magic and their animal spirits known as daemons.
When Eliza Scarlet's father dies, he leaves her penniless, but she resolves to continue his detective agency. To operate in a male-dominated world, though, she needs a partner - step forward a detective known as the Duke.
The series follows the conflicts surrounding the new money Russell family and their old money neighbors, the van Rhijn family, in 1880s New York City high society.