Arkady Rukoyatkin is a wealthy, intelligent man, a successful entrepreneur, who has never done or wished harm to anyone. He lost all his close relatives and became of no use to anyone - except those who needed his money! If it weren’t for the parrot, no one would have known about his violent death, because only the bird loved Rukoyatkin! And it had to happen that the mourning cockatoo fell into the hands of the amateur detective Doctor Knyazev, known under the nickname Monomakh, and he decided to shed light on the strange circumstances of Rukoyatkin’s death...