King Ludwig II ruled Bavaria for 22 years, commissioning extravagant castles throughout his homeland and exhibiting such bizarre behavior that he was eventually declared insane. According to legend, Ludwig had stockpiled a massive cache of gold and jewels that would finance the construction of the largest castle of all time. But in the years since the king's mysterious death, no one has found any evidence of such a trove. Until now. Jonathon Payne and David Jones are pulled into the mystery by a colleague, who asks them to investigate the legend. They agree, and quickly find themselves in a life-or-death struggle to uncover the truth about Ludwig's death, his mythical treasure, and who would be willing to kill for it.