Shadows of the Old Apartment

1959. In the city of Leningrad, an old lady, a former 'dandelion,' is poisoned by one of the residents of the communal apartment. The criminal was never found. And so, half a century later, Maria Karavai takes on the investigation of the old murder. World-renowned cellist Ksenia Averintseva buys an apartment overlooking the Griboedov Canal. Upon learning this, her grandmother dies of a heart attack. By a fateful coincidence, she lived in that old apartment and was a suspect in the unsolved case. But Ksenia cannot believe that her grandmother is a murderer. She asks Maria Karavai for help, and she agrees. Gradually unraveling the secrets of the residents of the communal apartment, Masha and Ksenia get closer to the main mystery, which is deadly dangerous for the living. What began as an amateur archival investigation turns into a gripping thriller. Hiding in the labyrinths of St. Petersburg courtyards and in the old forts near Kronstadt from her pursuer, Maria Karavai tries to find the lost information that has been forgotten in time...