This episode details the unraveling of the Cambridge Five spy ring, focusing on Kim Philby’s efforts to warn Donald Maclean after the Venona project exposed Soviet penetrations in the US. As MI5 narrowed in on Maclean, Philby and Guy Burgess orchestrated a chaotic escape, with Burgess fleeing to Moscow to escort Maclean across Europe. The fugitives’ departure triggered a massive investigation that implicated the entire ring, leaving Philby in Washington to face the consequences of his compromised network.
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