The book describes, in first person, a 17-day journey on his motorcycle from Minnesota to California by the author (though he is not identified in the book) and his son Chris, joined for the first nine days by close friends John and Sylvia Sutherland. The trip is punctuated by numerous philosophical discussions, referred to as Chautauquas by the author, on topics including epistemology, ethical emotivism and the philosophy of science.
Many of these discussions are tied together by the story of the narrator's own past self, who is referred to in the third person as Phaedrus (after Plato's dialogue). Phaedrus, a teacher of creative and technical writing at a small college, became engrossed in the question of what defines good writing, and what in general defines good, or "quality". His philosophical investigations eventually drove him insane, and he was subjected to electroshock treatment which permanently changed his personality.
Towards the end of the book, Phaedrus's personality begins to re-emerge and the narrator is reconciled with his past.
Pirsig aims towards a perception of the world that embraces both sides, the rational and the romantic. This means encompassing "irrational" sources of wisdom and understanding as well as science, reason and technology. In particular, this must include bursts of creativity and intuition that seemingly come from nowhere and are not (in his view) rationally explicable. Pirsig seeks to demonstrate that rationality and Zen-like "being in the moment" can harmoniously coexist. He suggests such a combination of rationality and romanticism can potentially bring a higher quality of life.
