Review of Gray Day


In his book, Gray Day: My Undercover Mission to Expose America’s First Cyber Spy, Eric O’Neill chronicles his part in the quest to take down the worst Russian mole in U.S. History, Robert Philip Hanssen. Hanssen, an FBI agent who is suspected of spying for the Kremlin for nearly two decades, is set to retire in three months. The Agency has tasked O’Neill with shadowing and gathering evidence to convict Hanssen of espionage. O’Neill tells of the cat-and-mouse game employed to corner and apprehend the canny and diabolical spy that cost the U.S. in intelligence and lives.


Gray Day is a well-written account of secrecy, subterfuge, and suspicion, and O’Neill gives an inside look at the operational detail of one of the most daring and intriguing cases in FBI history. It is an enlightening and informative look at the depravity and hubris of human nature as law enforcement endeavors to entrap one of their own. O’Neill opens up about the toll that the case took on his personal life as well as his professional life. The narrative is both exciting and frustrating, as one of the worst traitors in history is able to elude capture for so long and is finally made to face justice.


Aside from a dense last chapter about cyber-security and a few expletives, Gray Day is a page-turning, tension-building journey into the world of covert espionage. I highly recommend it.

About Katherine Wacker

Katherine Wacker is currently a reviewer for Bethany House Publishers, and Howard Books. She is a Craftsman graduate of the Jerry B. Jenkins Christian Writer’s Guild. She holds a B.A in History from San Diego State-Imperial Valley Campus. In her spare time she likes to read books, watch sports, and do jigsaw puzzles. She lives at home with her parents, her dog, Roscoe, and kitty, Lily.
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2 Responses to Review of Gray Day

  1. Joelendil says:

    This sounds interesting! Ever since reading “The Spy Who Came In from the Cold” I’ve been intrigued with realistic spy fiction & history. One of the most interesting history books I have read so far this year was “The Spy and the Traitor” by Ben Macintyre about Oleg Gordievski, MI-6’s mole in the KGB (and Macintyres “A Spy Among Friends” about Kim Philby, the KGB’s mole in MI-6 was one of my favorites last year).

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