Theosophy in Poland was more than an esoteric movement; it represented an attempt to formulate a modern spirituality that joined mysticism with practical engagement and the search for meaning with ideals of service and brotherhood. This book uncovers the forgotten world of Polish Theosophists: artists, intellectuals, and reformers of everyday life who, in the early twentieth century, formed communities, organized lectures, and undertook publishing and social initiatives. Their understanding of spirituality encompassed not only beliefs about dimensions of reality imperceptible to the naked eye, but also education, vegetarianism, women’s rights, art, and natural medicine. Drawing on dispersed archival sources and publications, the author reconstructs the history of the Theosophical movement in Poland, from the first occult salons and artistic ventures to the establishment of the Polish Theosophical Society. It is a narrative of a forgotten facet of modernism, in which spiritual inquiry intertwined with social projects and esotericism became a tool for transforming reality.