UNDERGROUND: The Tokyo Gas Attack and the Japanese Psyche, by Haruki Murakami. Translated by Alfred Birnbaum and Philip Gabriel. Random House, Vintage International; 366 pp., $14.

On Monday, March 20, 1995, Tokyo experienced a terrorist attack. Sarin gas was released in the subways. While many of the perpetrators -- members of a religious cult named Aum Shinrikyo -- are still undergoing trial, the everyday aftereffects of the attacks live on in the Japanese psyche -- a kind of double violence of social stigmatization and posttraumatic stress disorder.

Best-selling novelist Haruki Murakami sensed a gap between the media coverage and the reality of people¡¯s experience, so he returned to Japan after many years abroad to go behind the headlines. What is the Japanese psyche, and how did it give rise to something like Aum?