The diaries of Fu Bingchang, Chinese Ambassador to the Soviet Union as the Cold War began.
Anne McElvoy explores the documents telling the story of the emigre agent Jurgen Kuczynski
For Radio 4's Cold War season, Gordon Corera examines CIA attempts to subvert Albania.
Gordon Corera reveals evidence of a secret deal between a code-machine company and the NSA
Dominic Streatfeild investigates the case of Argentine POW Alfredo Astiz in 1982.
Sanchia Berg rediscovers the lost trail of the MI5 spy who was left out in the cold.
Sarah Richardson discovers a document which shows that women in Lichfield voted in 1843.
Heather Jones explores a lost intelligence report warning of Germany's invasion of Poland.
David Loyn investigates how a lost record is helping Afghanistan address its painful past.
Gordon Corera travels to Stockholm to investigate the assassination of a prime minister.