Nina Vavilova is a talented guide, she conducts city tours and fights for historical monuments. She's been happily married for a long time. Her husband Artem is Nina's fulcrum and the only person she absolutely trusts. It seems to her that without him she would not be able to live a day. But a tragic accident turns her whole life upside down. One day Artem gets into a car accident together - with his second family-his common-law wife Masha and little daughter Katya.