This investigative journalism podcast explores the circumstances surrounding the death of King Boris III of Bulgaria in 1943. The podcast examines the historical context of Bulgaria's alliance with Nazi Germany, King Boris's defiance of Hitler's orders to deport Bulgarian Jews, and the subsequent rumors of his assassination. The investigation involves interviews with historians, family members, and experts on chemical weapons, analyzing documents from the British National Archives and other sources. A key finding suggests the possibility of poisoning via a nerve agent, potentially administered by the Nazis due to Boris's double-crossing. The podcast concludes by presenting various theories and evidence, leaving the listener to consider the complexities of the historical narrative and the challenges of definitively determining the cause of death.