The Edge of the Broken Moon.

Fourteen-year-old Sonya unexpectedly learns that her mother lied to her about her father's death for many years, and forbade him to communicate with her daughters. Unable to forgive such a betrayal, she runs away from home. Mother and older sister Sasha find Sonya at their old dacha, where no one has visited for many years. Three women are forced to finally talk through all the problems, grievances and fears that have been so carefully hushed up for years. This begins the long journey of restoring family ties.