Gray Day by Eric O'Neil
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Eric O’Neill, cybersecurity expert and former FBI “ghost” tells the thrilling story of how he helped take down notorious FBI mole Robert Hanssen, the first Russian cyber spy.
A tension-packed stew of power, paranoia, and psychological manipulation, Gray Day is also a cautionary tale of how the United States allowed Russia to become dominant in cyberespionage–and how we might begin to catch up.
Amazon and Kindle are the easiest places to find this book. I am at work and can't post a pic.