Tsar Ivan the Terrible died on March 18, 1584 in Moscow under mysterious circumstances. What is it - sudden death or insidious murder? Two of the most famous detectives of the Robbery Order are being investigated: the experienced Trofim Pyzhov and the young Markel Kosoy, whose exploits, when catching the perpetrators of the death of Tsarevich Dimitri, readers have already met on the pages of the novel "Uglitsky Case."