Esoteric scholar Manly P. Hall covers a lot of areas relating to the ancient mysteries, including common roots in religious and ritual practices, the practices of the Druids and how they relate to Masonry, the rites of Mithras, Simon Magus and the Gnostics, Abraxas, the Egyptian Serapis, the Odinic mysteries and how they compare, the rites of Eleusis, the Orphic mysteries, Bacchus, Dionysos, and much more.