Nikolai Vitoldovich Michalsky did everything possible so that his children would never know about the tragedy that took place within the walls of their home many years ago - Stasya and Stefan grew up as if under a glass bell. When the time came, Stasya fell in love and got married. But married life began to crack on the day when her brother brought his chosen one, dancer Zara, into the house. It seems that Stasi's husband and Stefan's fiancee are mysteriously related to each other, but they are trying to hide it. The atmosphere is gradually heating up. And then a family secret comes out...