'A thousand years hence is a city, deep underground, where every single person is blind. Except for Thurii Brook of Summerisland - he alone can see.
'This is the story of Thurii and of Corinth, eldest daughter of the Lords Spiritual. What terrible tragedy had happened all those years ago so frightening the Church that it had closed ranks and engaged in a massive cover-up?
'Corinth's father - the Lords Spiritual. What was his part in this? And Thurii? For he too was inextricably involved. Corinth's search for the truth leads to a tumultuous final battle in which she and Thurii have to fight for survival, not just their survival but that of the entire city'. (Source: back cover blurb.)