In London, at the age of one hundred and two, the very wealthy Baroness of Russian origin Bauch died. Numerous relatives from Russia had already begun to joyfully rub their hands in anticipation of a substantial inheritance, but then it turned out that, according to her will, the baroness had assigned her entire fortune... to her cat Felix. A fat, lazy Siberian cat! The law firm leading this case entrusted the care of the cat to the successful lawyer Ilya Starikov, and his friend, veterinarian Gleb Zvonitsky, to monitor the health of the furry millionaire. The friends met to discuss how they could now serve the tailed heir, but they never came up with a plan of action. Ilya was killed in his home surrounded by relatives and friends. Veterinarian Zvonitsky, drawn into this dark story, begins his own investigation...