About the book: 2013 / What to do if you become the owner of a rare coin? What to do if the coin suddenly disappeared, and an unknown person entered the apartment under cover of darkness in search of the cache in which the artifact was previously discovered? How can you stay away when there are so many secrets around, the holidays are in full swing, and you are fifteen years old? Gleb, Lyuska, Dimon and Alisa took up the investigation with such zeal and enthusiasm that they found themselves drawn into an insidious conspiracy of a real mafia. Not afraid of the consequences, the guys took a risk and infiltrated the enemy’s camp in order to obtain valuable information and save the life of one of their friends.