Violoncellist with the world name Ксения Аверинцева buys an apartment with a kind on the channel of Грибоедова. Knowing about it, her grandmother dies from a cardiac attack. On a rock coincidence, she lived in a that old apartment and was suspected in so not exposed business. But Ксения can not believe that her grandmother is a killer. She asks Maria round Loaf of bead about a help, and that consents. Gradually unraveling the secrets of habitants of communal flat, Masha with Ксенией approach a main secret mortally dangerous and for now above-ground. History beginning as the amateur archived investigation grows into a остросюжетный thriller. Hiding in the labyrinths of the Peter courts and on old forts near Kronshtadt from a pursuing her killer, Maria round Loaf of bead tries on grains to find the information forgotten in time.