Natalya, a successful rehabilitation doctor, works in the same hospital with her husband Yuriy. Family happiness is overshadowed by only one circumstance - due to biological incompatibility, they do not have children. But the couple does not lose hope. One day Natasha meets her lonely classmate Ira and invites her to her home for the anniversary of their life together. But Natalya cannot even imagine how this meeting will turn out for her. Irina makes an unexpected proposal to Yuriy.