In 1476, Karl the Bold, fleeing from the Swiss troops, leaves his jewels. Among them is Carl's talisman, a brooch decorated with three rubies called the "Three Brothers" and the diamond "The Great Diamond of Burgundy" .. Since then, no one has seen the lost jewels. Only five centuries later, Karl'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 jewels .. In the collection of Morosini's father-in-law - Moritz Klederman - there are already stones of Karl the Bold . Aldo Morosini will have to find out whose real, and whose only skillful fake ...