This interview-style podcast investigates the death of King Boris III of Bulgaria, exploring whether it was a natural death or murder. The episode begins with the discovery of the King's heart in a pickle jar in 1991 and the subsequent examination by Dr. Doichenoff, who concluded it was a heart attack. However, the podcast then delves into conflicting evidence, including accounts of the King's symptoms and the possibility of undetected poisons, ultimately leaving the cause of death ambiguous. The investigation involves interviews with the King's children, forensic pathologists, and other experts, highlighting the limitations of forensic science in different eras and the challenges of definitively proving or disproving a historical death. A key takeaway is the uncertainty surrounding the King's death, despite the initial conclusion of a heart attack, leaving open the possibility of foul play.