Gordon Corera travels to Stockholm to investigate the assassination of a prime minister.
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.
Using new documents, Mike Thomson investigates a largely forgotten massacre in India.
Mike Thomson explores a document pointing at American treachery prior to Pearl Harbour.
Mike Thomson examines documents revealing British brutality in Kenya in the 1950s.
Sarah Richardson discovers a document which shows that women in Lichfield voted in 1843.
Did the 1916 Dublin Rising catch the cabinet by surprise? Author Nick Rankin investigates.
Jeremy Duns examines links between MI6 and the British media during the Cold War.
Mike Thomson investigates the role of the BBC Hungarian Service in World War II.