1893. Wigan is in the grip of a harsh winter and a devastating national miners' strike. Arthur Morris, a wealthy colliery owner whose determination to cut the miners' pay is one of the main causes of the strike, is found brutally murdered in an alleyway. A sinister letter prompted the victim to leave his dinner guests and hurry out into the freezing night to Scholes, a rough working-class district where he is universally hated.

1894, Wigan. Miss Dorothea Gadsworth is interviewed for a teaching vacancy at George Street Elementary but is ultimately dismissed as a candidate. The following Monday morning, her body is discovered in a locked classroom with a note by her side. DS Michael Brennan is called in to investigate what appears to be a straightforward suicide, but his instincts tell him there is more to this case than meets the eye.