In this episode, Simon Parkin unravels an extraordinary tale of courage and sacrifice during World War II. His latest book, The Forbidden Garden of Leningrad: A True Story of Science and Sacrifice in a City Under Siege, chronicles the heroic botanists who risked, and in some cases, gave their lives to safeguard a priceless seed collection during the longest blockade in recorded history. They chose starvation over consuming the very seeds that could prevent future famines. Simon shares the story of visionary scientist Nikolai Vavilov and his dedicated team, who preserved the world’s first seed bank under unimaginable conditions.