The nest of migratory Sphinx

I want to shout: "Lord, deliver me from relatives, and the enemies I somehow itself will understand!" Never before had Ivan Podushkin was not necessary to play the role of a specialist interior designer. But this secrecy was justified. The writer Konstantin Amaretti, invited the detective to his estate, didn't want his mom and little brother found out who Podushkin really is and what purpose came here.
And the reason for the visit was good: recently Amaretti began to receive anonymous threatening letters, and he had every reason to believe that the author of these "creations" were some of his relatives. But soon the private detective had to investigate much more serious crimes! During his conversation with Constantine from the library came a wild cry. Escape the household and Podushkin found there the body of the unfortunate housekeeper Inessa with a strangely twisted mind. But most of all, Ivan was shocked by the reaction of the owner of the estate. For some reason he refused to call the police...