If you like crawling down rabbit holes like I do, Crowley’s unpublished legacy is basically a big attic full of notebooks, drafts, and spicy little side-projects. A lot of what he left behind wasn’t a tidy list of secret books but thousands of loose manuscripts: magical diaries (daily ritual notes, Enochian experiments, scrying sessions), poems and plays that never made it into his collected volumes, early drafts and variants of well-known pieces, and a mass of correspondence and ritual diagrams. There are multiple handwritten versions and annotations for major works—so you can find variant lines and marginalia for things associated with 'The Book of the Law' and fragments connected to 'The Vision and the Voice'—which fascinates people who want to track how his ideas evolved on the page.
Beyond those, there are technical notebooks full of ritual formulas, astrological charts, and tarot notes (some of which fed into 'The Book of Thoth'), plus essays that were never widely circulated because of their explicitness or narrow audience. Many of these items were dispersed after his death: some ended up in institutional archives, a fair bit in private collections, and portions have surfaced at auctions over the years. Scholars and collectors have gradually edited and published selections, but huge swathes remain unpublished or only partly transcribed. If you love marginalia and the messy life of a magical practitioner, Crowley’s unpublished manuscripts are pure gold—chaotic, intimate, and often maddeningly incomplete.