Invisible threads

Victor shot when he walked peacefully with the dog. Who, why, why? His brother Semyon and the stairwell of Natasha are lost in conjectures. Semyon and Natasha met by accident, but they were immediately drawn to each other... The police slowly understand the murder, and Victor's relatives, it would seem, continue to live their own life, but at the same time they are approaching a pessing step. How else, if everyone is interconnected by invisible threads? It is only necessary to pull the right one - and everything will be revealed...