Amateur detective Nadezhda Lebedeva, despite her husband’s obvious disapproval, got involved in another investigation. This time everything is very serious - two of her old acquaintances die one after another, attempts are made on the third and on Nadezhda herself. The women are united by the fact that twenty-six years ago they were all in the same maternity hospital. The matter is complicated by the fact that the detective is kidnapped in broad daylight by representatives of the secret services, and only by a miracle does she manage to escape unharmed. Now Nadezhda must find out what kind of secret of national importance remained in the ward of the old maternity hospital...