The happy and measured life of the architect Andrei and his wife Olya is destroyed by robbers when they break into their house. Olya is very upset about what happened. Andrei dreams of erasing this incident from her memory. The search leads him to a strange apartment in the House on the Embankment, where the mysterious Mara lives. She promises effective medicine. Andrey agrees. But soon Olya began to show side effects ...