The latest Tan Books newsletter has announced a new book, Hungry Souls: Supernatural Visits, Messages, and Warnings from Purgatory, in celebration of Holy Souls month.
"...Hungry Souls recounts these stories and many others trustworthy, Church-verified accounts of earthly visitations from the dead in Purgatory. Accompanying these accounts are images from the "Museum of Purgatory" in Rome, which contains relics of encounters with the Holy Souls, including numerous evidences of hand prints burned into clothing and books; burn marks that cannot be explained by natural means or duplicated by artificial ones. Riveting!"
You can read more about the "Museum of Purgatory" here. Interestingly, Tan Books still considers purgatory a fire to be suffered, an idea that tends to be downplayed by many RCs today:
"November is the Month of Holy Souls. In our Charity, we must not neglect to pray for these men and women who are ultimately assured of becoming saints, yet suffer in Purgatory’s fire. They have felt the struggles and crosses of this life and still need our prayers to attain their reward..." source