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Sisters of the Immaculate Fire is a role-playing game sourcebook of supernatural investigation set in the late 19th century. It details the S.I.F., a mystically inclined order of Catholic sisters who investigate and deal with supernatural incidents around the world.
The sourcebook is divided into several chapters. The Sisters covers the history, purpose and organization of the order itself, from its origins in early modern Portugal down to the end of the 19th century. Artifacts and Relics, Enigmas, Mysterious Places, and Unusual People provide a catalogue of people, places and things the S.I.F. is likely to encounter in the pursuit of their unique vocation, while The Duchy of Witzburg is a brief sample setting, a small fictional member state of the German Empire. Finally, Miscellany offers a few odds and ends useful for an S.I.F. game.