The Boke of Gostely Grace is a Middle English translation of the Liber specialis gratiae by the German visionary Mechthild of Hackeborn (1241–1298), a Benedictine/Cistercian nun at the convent of Helfta. This new Companion will add momentum to the current interdisciplinary and theoretical debate surrounding Latin texts and their translations into the vernacular, including a number of issues regarding women’s literary culture. It complements and supplements the new critical edition of the text, The Boke of Gostely Grace , edited by Naoë Kukita Yoshikawa and Anne Mouron with Mark Atherton, published by Liverpool University Press in 2022. A comprehensive introduction is followed by three parts. Part 1 examines vernacular translations of the Liber specialis gratiae from the late medieval and early modern periods in German, Dutch, Swedish, Italian and French. Part 2 explores a wide-range of critical issues in The Boke of Gostely Grace , and in particular aspects of the spirituality of Helfta. The volume concludes in Part 3 with aspects of the Last Things at Helfta, more specifically purgatorial piety and the theme of the dying and the dead. The volume as a whole provides a new and nuanced understanding of how the mystical literary output of Helfta circulated and was received in the late medieval literary culture of England and Europe.