»The Cuckoo's Egg

Clifford Stoll wrote this tense and thrilling account of how he tracked a hacker from his Berkeley UNIX system. This was one of the first episodes of computer forensics, and has become perhaps the most famous. An astronomer, Stoll had the role of sysadmin thrust upon him, and found himself tangled in an international mess. His book includes some tantalizing technical details showing how assumptions in UNIX made for easy hacking.
Stoll now sells Klein bottles and continues work with computers and telescopes. The Electronic Frontier Foundation maintains an online copy of his Stalking the Wily Hacker, the ACM article in which he first published the forensic techniques.