Host Becky Milligan meets King Boris III’s children at Vrana Palace, a royal residence on the outskirts of Sofia, Bulgaria’s capital city. The children share the details of their father’s strange and painful death. Officially he dies of a heart attack, but the symptoms don’t add up. What—or who—is responsible? Becky speaks to witnesses who explain how Boris duped Hitler. But the discovery of a dusty document, thousands of miles from Bulgaria, makes Becky wonder if she’s way off course.