The Cuckoo’s Egg (1989)

When an astronomer turned systems administrator spots a seventy-five-cent accounting discrepancy in his lab computer logs, he uncovers a covert digital intrusion. His solitary investigation balloons into an international counter-espionage manhunt involving the CIA, FBI, and the KGB. Stoll's first-person procedural captures the foundational dawn of cyber espionage with authentic investigative suspense.