Grimus is a “futuristic fantasy” about an immortal native American called Flapping Eagle, whose quest it is to find his sister Bird-Dog and vanquish the archwillain Grimus, ruler of Calf Island. Due to Flapping Eagle’s posthumous birth, the siblings are virtual outcasts, which is why they have little difficulty in leaving their people when they are offered immortality. In the middle section of the novel Flapping Eagle abandons his companion and attempts to settle down in the town of K, where he wreaks have on its population by depriving some inhabitants of the absolute certainty that is necessary to fight off the “Dimension-fever” caused by Grimus. The problem with this novel is that science fiction is usually a fundamentally rational genre.