Father Brown is based on G. K. Chesterton's detective stories about a Catholic priest who doubles as an amateur detective in order to try and solve mysteries.

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. Eliza and The Duke strike up a mismatched, fiery relationship as they team up to solve crime in the murkiest depths of 1880’s London.

A decade after Jallow's sexual relationship with his teacher, Miss Watkins, they meet again and are forced to confront the past they never quite escaped.

Recollecting her youth during the 'Baby Scoop Era', Edith looks back on Solidago, an all-female rural community she was sent to in order to give birth to a child conceived outside of marriage.