On June 28, 1914, the assassinations of Franz Ferdinand and Sophie Chotek set off the chain reaction we call World War One — but almost nobody knows that a paperwork error at the Sarajevo morgue sent three European ambassadors scrambling to the wrong location for 96 critical hours, during which two back-channel peace proposals were drafted, nearly delivered, and then quietly buried. This week, we follow the Habsburg court clerk who made the mistake, the Serbian diplomat who almost intercepted history, and the single telegram that arrived fifteen minutes too late.