About the book: 2015 / Dimon tells his friends that he is being followed: a man in a gray sweater is following on his heels. The best way to find out the identity of an unknown person is to follow him yourself, which is what the guys do when they find themselves in an old five-story building about to be demolished. In one of the rooms they find the man’s things, including an old photograph. However, on the same day the man disappears and his things burn. There are no more clues! Although no, one still remains - the same photograph that Lyuska managed to hide. The guys take on a new task…