Cuckoo's Egg

A 75-cent discrepancy in billing for computer time led Stoll, an astrophysicist working as a systems manager at a California laboratory, on a quest that reads with the tension and excitement of a fictional thriller. Painstakingly he tracked down a hacker who was attempting to access American computer networks, in particular those involved with national security, and actually reached into an estimated 30 of the 450 systems he attacked. Initially Stroll waged a lone battle, his employers begrudging him the time spent on his search and several government agencies refused to cooperate. But his diligence paid off and in due course it was learned that the hacker, 25-year-old Markus Hess of Hanover, Germany, was involved with a spy ring. Eight members were arrested by the West German authorities but all but one were eventually released. Although the book will be best appreciated by the computer literate, even illiterates should be able to follow the technical complexities with little difficulty. Literary Guild selection. (Oct.)