Seventeen years after the publication of his still-popular road story/philosophical meditation, Zen and the Art of Motorcycle Maintenance , Pirsig offers another lengthy and absorbing investigation of how we can live well and rightly. Phaedrus, the one-named narrator "who had written a whole book on values," is sailing down the Hudson River when he meets Lila Blewitt, an unapologetically sexual, psychologically unstable woman whom a mutual friend warns him against. But Phaedrus is drawn to her physically and interested in her intellectually, finding her "a culture of one" in whom he discerns an unexpected "Quality." Sailing with him to Manhattan, where her mental state deteriorates further, Lila prompts Phaedrus to explore conflicts of values like those between Native Americans and Europeans or between the insane and the normal. Finally, after years of struggling, he formulates his "Metaphysics of Quality" which offers a system of understanding — and evaluating — actions according to a hierarchy of four evolutionary realms (natural, biological, social and intellectual). Though Lila's fate is left unresolved, Pirsig's wide-ranging philosophical explorations will provoke and engage readers.