Matthew Trevelyar leaves his job in London to return to his Cornish roots in the village of St Agnes. After losing his wife to leukaemia, he wants to make a fresh start.
His new life is going well until Matt returns to his cottage to discover a grim warning on his doorstep. The message is clear – Leave now and go back to London.
Not wanting to give up his new life, Matt eventually discovers that there has been a 200-year-old feud between his family, the Trevelyars, and another local family, the Penhallows.
When Matt learns that one of his ancestors burned down a barn belonging to the Penhallows, and that there were tragic consequences, he understands why his family name is mud. But why is Matt paying for the sins of his ancestors now? And is there more to the feud than meets the eye?