by Clifford Stoll, originally published in 1989, Kindle edition by Doubleday, 2012

Clifford Stoll was an IT employee at Berkeley Labs in the 1980’s when he noticed a discrepancy of only 75 cents between the computer logs that tracked usage of the mainframe computers and the billing records.  Through his investigation, he discovered that a hacker was accessing the computers at Berkeley and subsequently at other supposedly secure computer sites in the U.S.

Because Stoll kept a log of all of his actions, he was able to write a detailed account of how he tracked down the perpetrator.

The book is a little dated as it references some systems that are no longer in use and, because of the detail the author provides, it sometimes drags a bit.  Nevertheless, the book is a very interesting story about how he tracked down the hacker and it also provides some helpful insight as to how to protect computers from such assaults, even in today’s world.