The definitive account of the famous Portland Spies - fascinating, detailed and completely gripping -- Richard J Aldrich, author GCHQ

I read DEAD DOUBLES with admiration...fascinating and meticulous...Using all available American, British and Russian sources, Trevor Barnes has produced a remarkable book -- Harvey Klehr, co-author SPIES: THE RISE AND FALL OF THE KGB IN AMERICA

A highly readable account of a classic Cold War MI5 investigation. Assiduously researched and a real page-turner -- Nigel West, author of MI5 and THE ILLEGALS

Excellent and riveting, with a cast of characters as engaging as in any novel. Former KGB officer Vladimir Putin's modern-day Russia employs the same espionage methods now against the West. The themes of Dead Doubles - deception, betrayal, blackmail, chemical and biological weapons, atomic secrets, international rivalry - are as topical today as in the 1960s -- John Sipher, Former Head CIA Russian Operations and CIA Station Chief in Asia and Europe

A gripping and brilliantly researched history of the rise and fall of the Portland Spy Ring, which reveals much about the operations and personnel of Russian, British and American intelligence at the height of the Cold War -- Christopher Andrew, author of DEFENCE OF THE REALM and THE SECRET WORLD

An enthralling account of one of the last great spy mysteries of the 20th Century - I loved it -- John Preston, author of A VERY ENGLISH SCANDAL

Dead Doubles will keep readers on the edge of their seats, turning its pages like a delicious spy novel. Its pace and wide scope of research take us into a hidden corner of Cold War England in the early 1960s -- Katherine Sibley, author of FIRST LADY FLORENCE HARDING and RED SPIES IN AMERICA

Reads like a le Carré thriller - only true. Rich in detail. A must read -- Ray Batvinis, former FBI Supervisory Special Agent of Counterintelligence and author of Hoover's Secret War Against Axis Spies

A rare combination of thrilling story and carefully documented history, the writing has a remarkable "you are there" quality that transports the reader back to the height of the Cold War -- Nicholas Reynolds, former CIA Officer and author of NYT bestseller WRITER, SAILOR, SOLDIER, SPY

An exemplary work of historical scholarship that is also highly entertaining, Dead Doubles is the definitive history of the Portland spy ring -- John Earl Haynes, co-author of EARLY COLD WAR SPIES

Gordon Lonsdale was a classic KGB illegal resident who never gave up his true name, background, or his agents' identity after his arrest and imprisonment, before he was exchanged for Greville Wynne. Even his memoirs, ghosted by Kim Philby, didn't answer these questions. But Trevor Barnes sets the record straight in his new book based on archival MI5 records and Russian sources. It is well written, thoroughly documented, and a most valuable contribution to the intelligence literature -- Hayden B Peake, Colonel, Military Intelligence, USA, Ret.

Even better than any spy novel -- Matt Chorley ― TIMES RADIO

Fact outdoes fiction in this fascinating, revealing and gripping account of how MI5 tracked down the infamous Portland Spy ring, from the first clue to their arrest in 1961 ― CHOICE

Winston Churchill once wrote of the world of espionage that 'the actual facts of many cases were in every respect equal to the most fantastic inventions of romance and melodrama'. His words could certainly be applied to the Portland Spy Ring, memorably recounted here by Trevor Barnes. After the CIA told MI5 in 1960 someone was stealing secrets
from the submarine research base at Portland, Dorset, the information led to extraordinary revelations. Unlikely spies were living in suburban Ruislip and, under false identities stolen from the dead, a circle of deep-cover KGB agents was operating in Britain

-- Nick Rennison ― DAILY MAIL