Linda Kinstler’s Latvian grandfather disappeared after WWII and the family never spoke about him. But as she delved into Boris Kinstler’s life she found he had been a member of a killing brigade in the SS linked to the ‘Butcher of Riga’ Herbert Cukurs, before becoming a KGB agent and then vanishing. She attempts to uncover the truth in Come To This Court and Cry: How The Holocaust Ends, but also interrogates the uncertainties of memory, family, nation and justice.

Although Herbert Cukur’s name came up frequently at the Nuremberg war crime trials for the killing of tens of thousands of Jews, he managed to escape and find refuge in South America. It was there he was murdered by Mossad agents who left a note from Those Who Will Never Forget saying ‘the condemned man has been executed’. The Israeli investigative journalist Ronen Bergman has uncovered his country’s most secret activities in Rise and Kill First: The Secret History Of Israel's Targeted Assassinations (translated by Ronnie Hope).

The Nuremberg trials in the aftermath of WWII mark the birth of international law and set the framework of modern human rights law. The barrister and writer Philippe Sands has appeared frequently before international courts, and has been involved in many of the most important cases of recent years from Yugoslavia to Rwanda to Guantanamo. He explains what can be done when countries – like Russia – refuse to recognise the jurisdiction of international law.

Producer: Katy Hickman