"The Key to All Doors" is a Russian melodramatic series about the life and work of psychologist Anna Koroleva. The woman has developed a unique method for dealing with conflicts and stress. After her sessions, patients emerge as completely new people, forgetting all their personal dramas and family quarrels. Additionally, Anna supports them outside of her office, coming to their aid in critical moments. However, it turns out that her method doesn't work with her own personal life. She will have to choose between her career and her family.