A Book of Secrets by Kate Morrison
When Susan comes of age, the family marry her off to an older Catholic man, John Charlewood. Charlewood runs a printing press and uses it to supply the Papist nobility with illegal Catholic texts and foment rebellion amongst the Catholic underclass. When Charlewood dies, Susan takes over the business and uses her new position to find out more about her origins.
A look at racial relationships on the eve of the beginning of the transatlantic slave trade, A Book of Secrets is a revealing and compelling glimpse into a fraught time.