The Book of Margery Kempe (ca. 1438) offers an illuminating account of late medieval female spirituality, affective devotion and subversion. This study approaches Margery Kempe's roles in her earthly, heavenly and spiritual families from an interdisciplinary perspective. It details the tension between the domestic and spiritual life of the eccentric visionary and examines the intense agony and ecstatic pleasure imposed on her by the divine. Extensive research is devoted to late medieval female mysticism and the complex question of authorship and genre of The Book of Margery Kempe. In addition to a meticulous textual analysis, contemporary socio-religious, historical, medical and legal sources yield profound insights into the emotional and spiritual climate of the late Middle Ages.