The plot of the Series «Euler’s Riddle» follows Olga, who goes to a class reunion. Their class seems to be plagued by misfortune: not long ago, their mutual acquaintance Katerina was murdered, and two more people died in an accident. The streak of bad luck began with the suicide of Alina, who had been withdrawn and behaving strangely. Even stranger is Alina’s suicide note—it is a mnemonic poem for Euler’s chess riddle. The former classmates continue to die. Olga begins to suspect that none of their deaths are accidental. But will she be able to find out who is behind it all before it is too late? Watch the Series «Euler’s Riddle» online with ivi.