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Book Review: The Defector by Richard Kerba

May 09, 2026 10:29 AM | Anonymous

THE DEFECTOR: THE UNTOLD STORY OF THE KGB AGENT WHO EXPOSED THE CIA AND SAVED MI5

BY RICHARD KERBAJ
APRIL 28, 2026
PUBLISHER: HARPER COLLINS

 


 The Defector is the untold story of how the defection of KGB agent Oleg Lyalin led to the expulsion of more than a hundred Soviet spies from Britain. 

 At the heart of Lyalin’s story is a narrative entwined with lies, disinformation, Kremlin deception campaigns, paranoia, intelligence failures by the CIA and MI5, and a tangled love life.  

Unravelling amidst a Soviet mission to plant fake Kremlin ‘defectors’ within British and American intelligence agencies, this story reveals how the secrets Lyalin divulged, resulted in one of the most dramatic and pivotal moments in the Cold War. 

Lyalin led MI5 to rethink its relationship with the CIA and, ultimately, helped destroy the reputation of the US agency’s head of counterintelligence, James Jesus Angleton.

Drawing on newly declassified intelligence files, dozens of interviews with spymasters, and told in full here for the first time by one of Britain’s leading commentators on national security, this story reveals how during the darkest moments of the Cold War one of the West’s greatest achievements transpired as a result of MI5’s break with the CIA. 

The disclosure of the inside story of this historic event also comes at a time when there is a renewed tension in the relationship between transatlantic spy services – from the intelligence they share or hold back, to the way they respond to their political masters and stand up to threats from Russia. 

Indigo Amazon 

  

Reviews: 

"An absolutely thrilling read, based on deep research, which brings this MI5 asset’s importance to life" - Gordon Corera, co-host of The Rest is Classified 

“One of the most sensational episodes of the Cold War.” - Sunday Times (London)

“Dynamic and vivid…. Kerbaj skillfully makes major figures of the Cold War cloak-and-dagger operations come to life.” - Dr. Filip Kovacevic, author of KGB Literati: Spy Fiction and State Security in the Soviet Union 

“The Defector reads like le Carré but uncovers important truths that are being played out in Putin’s Russia today.” - –Robert Verkaik, bestselling author of The Traitor of Colditz

See also: 

The Defector as reviewed by Tim Willasey-Wilsey for The Cipher Brief – January 6, 2026

  

KGB spy Oleg Lyalin, pictured partying in London in 1969, was regularly seen at late-night bashes and had multiple girlfriends on the go. Credit: Shutterstock Editorial

 About the book: 
The Defector: The Untold Story of the KGB Agent who Exposed the CIA and Saved MI5 by Richard Kerbaj 

Harper Collins - 356 pages $17.99 (Kindle)

Publication Date: April 28, 2026

 



About the Author: Richard Kerbaj
Richard Kerbaj is a BAFTA-winning and two-time Emmy-nominated filmmaker and writer who has specialised in investigating crime and national security-related stories for 15 years.

His first film, My Son the Jihadi, won four awards, including the 2016 BAFTA for best single documentary, and was nominated for an International Emmy and a Prix Italia.

His second film, Hunting the KGB Killers, was a critically acclaimed documentary for Channel 4 on Scotland Yard’s investigation into the murder of former Russian spy Alexander Litvinenko. 

HBO commissioned Richard to write and produce Unmasking Jihadi John: Anatomy of a Terrorist - a feature documentary which was released on its platform in July 2019. It was recognised for multiple awards, including BAFTA and Emmy nominations for best current affairs.  

Richard is also a multi-award winning print journalist who who began his career in Australia, working on a range of broadsheets, including The Australian newspaper. During his time on the paper, he won Young Journalist of The Year and Journalist of The Year in 2007. He then migrated to Britain in 2008 to work as an investigative reporter and foreign correspondent for The Times of London. In 2010, Richard moved to The Sunday Times and became the newspaper's security correspondent. He jointly won the Scoop of the Year at the British National Press Awards in 2018. 

In October 2020, Richard left full time newspaper journalism to focus on filmmaking and writing. Biography Credit: C&W (Conville & Walsh)

  Book Review / Revue de livres 

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Book Review Editor: Ralph Mahar - Suggestions for Book Reviews will be gratefully received at 
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