Is Тайный дневник моей сестры coming back?

Marina has been married to Gosha for 14 years, they got married right after graduation. Recently, there has been a crisis in their relationship: it was not the first time Marina had a miscarriage at an early stage, Gosha threw himself into work. Marina began to wonder if such a family life was suitable for her... Moreover, before her eyes is the example of her older sister Lyuba, whose personal life was a success.
Soon the news comes that Lyuba has died. Marina can't believe the accident. She finds her sister's childhood diary and in it notes made recently. It turns out that the exemplary Lyuba was unhappy and lonely for a long time. What happened to my sister? Who is to blame for her death? Marina decides to conduct her own investigation.