In this book, Véronique Bouillier gives a description of an Indian Saivaite sect, the Nath Yogis. Through the example of this sect, the social anthropologist examines the main features of Hindu asceticism i.e. the interweaving of a tradition of personal spiritual and ascetic quest and a collective organisation. She suggests that this collective organisation which relies on monastic institutions has enabled Hindu asceticism to endure and innovate. This volume, which draws on detailed ethnographic fieldworks as well as various historical sources to portray a vivid sect, is divided into three parts. The first part is a general presentation of the Nath Yogis, the second and the third parts describe the double configuration of the sect through the collective and personal monasteries. The author builds step by step her argument and her rich and detailed book can be read as an in-depth journey within the Nath Yogi world which leads us to Nepal, Karnataka, Rajasthan and Haryana.