The aim is to investigate how digitisation and in particular e-books have changed relations between private players and public institutions within the Danish book world through a case study of eReolen, a private-public partnership functioning as common platform for public libraries’ lending of e-books in Denmark. Traditional and new models of the book world are discussed as the basis of understanding relations between the players. A new way of analysing the field outlined by literary sociologist, Professor Johan Svedjedal, is adopted. The main conclusions are that the lending of e-books has disrupted the traditional understanding and interaction between the public library system and the commercial book market. In addition, the Danish library system through the partnership has taken on a new function in relation to the commercial market, namely acting as the engine in building a market for Danish e-books.