Written in collaboration in 1922 by the author of Felifax, this five-volume saga (of which this is the last), which chronicles the early years of the 21st century, takes place in a quasi-utopia-like Earth, where, thanks to the genius of master scientist Oronius, humanity has mastered natural forces. However, Oronius' former colleague Otto Hentzen, a mad scientist who has allied himself with the beautiful, deadly Princess Yogha, has sworn revenge on the master scientist. This time, the diabolical Hantzen, who has insidiously taken over another country under the alias of Professor Astaroth, Satan's Rival, plots to unleash a pandemic of madness on the women of the world. It is up to Oronius' faithful and resourceful servants, mechanic Victor Laridon, chambermaid Turlurette, and jack of all trades Julep, to thwart the demoniacal scientist… This edition includes two more stories by H.-J. Magog.