In 2 Maccabees 12:44-46, Judas Maccabeus makes atonement for the dead, and the text praises this practice as something holy and pious. From this, beginning in the earliest centuries of Christianity, the practice of praying for the departed arose. Saint Odilo of Cluny established this commemoration in the Cluniac monasteries in the eleventh century by praying for all the Faithful Departed, not only for our relatives and friends, but for everyone. Thus, remembering the most forgotten who have died throughout the centuries and for whom we can pray, this book invites us to practice a profound work of spiritual mercy. Based on this traditional devotion that comes from the earliest centuries of Christianity, with biblical foundation and emphasized by saints such as Saint Odilo of Cluny, this book offers a collection of prayers to aid the most abandoned souls in purgatory. With a novena of prayer for the most forgotten souls in purgatory, spaces to write down intentions, biblical quotations, and traditional images, this is a book that helps one live out this practice of Christian intercession with recollection, charity, and hope.