1893. Wigan is in the grip of a devastating national miners' strike and a harsh winter. Arthur Morris, a wealthy colliery owner whose intransigence on miners' pay is the main cause of the strike, is found brutally murdered in Scholes, a rough working-class district where he is universally hated and blamed for the grinding hardship the strike is causing. Detective Sergeant Brennan is tasked with finding the murderer and when a mysterious stranger is found bludgeoned to death, Brennan starts to unravel a twisted thread of interwoven clues that will lead to the murderer.

1894, Wigan. After interviewing for a teaching vacancy at George Street Elementary School, Miss Dorothea Gadsworth was ultimately dismissed as a candidate. The following Monday morning, the school caretaker discovers her body 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. With the door locked from the inside, staff members with plenty to hide and a student missing from the school, DS Brennan, aided by the scowling Constable Jaggery, wrestles with one of his most intricate investigations yet. As the duo unravel the twisted web of secrets and lies, the death is linked to a terrible accident fifteen years ago that changed the lives of all involved.