Treasures of the Green River

In ancient times, especially during years of hardship - various disputes, wars, epidemics - people hid their most valuable belongings in secret places until better days. It happened that the better days never came, and the hidden treasures remained unused. One such treasure was accidentally discovered by Seryozha Korablev and his friends. Without a moment of doubt about their strength and abilities, the guys set off to the Berezina River to those places where in 1812 the Russian army drove the almost defeated French army out of Russia. Could these be the 'most famous treasures of Napoleon?!
Read also about the amazing adventures of Seryozha, Nastya, and Deniska in the novellas: «To the Right of the Star», «Not a Day Without a Mystery», and «The Magic of the White Stone».