Dive into the 'Sumerian Vortex' and the 'Pub People' sagas. 'Mayo Goes Mental' is the sequel to 'Sumerian Vortex: Music From a Lost Civilization'. The 'Pub People' volumes are collections of short stories centered around Geraghty's Pub. The book '1984 + 38 + ?' tells a different story, but all volumes share the same universe.