Marina is a masseuse-cosmetologist in a small seaside sanatorium. Her husband Alexei - a former athlete, works in the same sanatorium as an instructor in physical therapy. They are a wonderful couple: together they built a house and raised a daughter.

But one day a beautiful and confident woman Lisa comes to the sanatorium. She meets Alexei. Everyone around her assures her that he is a faithful husband and has never betrayed his wife in twenty years. But no man in Lisa's life has refused yet, she decides to introduce him from the family ...