Cliff Stoll was an astronomer turned systems manager at Lawrence Berkeley Lab when a 75-cent accounting error alerted him to the presence of an unauthorized users on his system. The hacker's code name was "Hunter"--a mystery invader hiding inside a twisting electronic labyrinth, breaking into U.S. computer systems and stealing sensitive military and security information. Stoll began a one-man hunt of his own, spying on the spy--and plunging into an incredible international probe that finally gained the attention of top U.S. counter-intelligence agents. The Cuckoo's Egg is his wild and suspenseful true story--a year of deception, broken codes, satellites, missile bases and the ultimate sting operation--and how one ingenious American trapped a spy ring paid in cash and cocaine, and reporting to the KGB.