"The Cuckoo's Egg: Tracking a Spy Through the Maze of Computer Espionage" by Clifford Stoll was a great read. The title gives away the premise of the book, but

"The Cuckoo's Egg: Tracking a Spy Through the Maze of Computer Espionage" by Clifford Stoll was a great read. The title gives away the premise of the book, but to think - it was all put into motion because of a $0.75 accounting discrepancy.