The Abolitionist (Waterman #1.1)
Dusk Peterson

When a foul-mouthed, seditious foreigner turns up at your door, what are the benefits of letting him in? So wonders Carr, a young man living in a bayside nation that is troubled by internal battles. In his world, servants fight against masters, tonging watermen fight against dredging watermen, and landsteads eye one another's oyster grounds with greed. It seems to Carr that the only way in which to keep such warfare from entering his own home is to keep very, very quiet about certain aspects of himself which his family would not be able to accept.
But "trouble" is a word that appears to delight the new visitor. He is ready to stir up danger . . . though he may not be as prepared as he thinks to confront what lies within Carr.
This novel about an unconventional pairing features a special appearance by a character from the Slave Breakers series by Sabrina Deane. The novel can be read on its own or as the first story in the "Master and Servant" volume of Waterman, a historical fantasy series and retrofuture series inspired by the Chesapeake Bay oyster wars, boarding school rivalries in the 1910s, and 1960s visions of things to come.