Lyuba lives as if in Christ’s bosom – an intelligent and well-off family, a good profession, a loving husband. It seems that there are no cracks in this ideal world.
But Lyuba’s father before his death shares with her a mystery of the past: he has got an illegitimate daughter – the fruit of a short affair – left by him to her fate.
Lyuba begins searching for her sister. Soon she realizes that the girl has gone through the living hell, and she must help her at all costs…