We are pleased to present the results of extensive research into the work of prison staff in the state of Mato Grosso do Sul, Brazil. The authors present a detailed overview of the concepts of quality of life, prevention and health promotion, as well as an assessment of mental health. Sonia Grubits introduces the book with a brilliant note: "It is also worth highlighting, as important data on the work, the efforts that Jane Maria Motta Stradiotti has been making in the coordination of women's penal units in the state of Mato Grosso do Sul to humanise the institution, preparing and guiding the different teams of prison professionals to seek better conditions in relation to the mental health of these servants who work directly with people in prison". Jane and her colleagues tell the story of the Brazilian prison system and their state, revealing how prison administration and security behave. Suitable for academics, public security officials and legal experts, this book provides an insight into the mechanics of prison administration, its daily challenges and the impact on its staff.