The thesis focuses on book circles in middle school. The objectives of the work are to investigate how school librarians feel about their work with book circles as a reading promotion tool. The work is also linked to what possibilities and challenges school librarians see with book circles as a reading promotion tool. The study is based on semi-structured interviews with five staff who works in school libraries. The theory and the analytical method used are based on Chambers’ “Reading circle”. It consists of different parts of the reading process: to choose, to read and to respond to literature with adult support. The conclusions of this thesis are that school librarians feel that book circles are a reading promotion tool that works well for middleschool students, all the participants expressed that they felt that the students enjoyed participating in groups where they read and talk about how they feel about what they are reading.