All of Grant’s works were highly influenced by Crowley’s Thelemic tradition. One particular work, which holds considerable interest, is Nightside of Eden in which Grant proceeds to describe what he refers to as the Tunnels of Set.
A close examination of the Tunnels of Set will bring the reader to a realization that Crowley might not have been Kenneth Grant’s only influence for this darker side of occult mysticism. It seems that Grant’s Nightside of Eden is also somewhat rooted in the works of H.P. Lovecraft and his often referred to tome the Necronomicon.