In 1476, Charles the Bold, fleeing from Swiss troops, left his jewelry. Among them is Charles' talisman - a brooch decorated with three rubies, called the "Three Brothers", and the "Great Diamond of Burgundy" diamond. Since then, no one has seen the lost jewelry. Only five centuries later, Charles’s stones will fall into the hands of Prince Aldo Morosini and turn his whole life upside down... It turns out that he is not the only owner of the famous jewelry. The collection of Morosini's father-in-law, Moritz Clederman, already contains stones from Charles the Bold. Aldo Morosini has to find out whose is real and whose is just a skillful fake...