Lawyer Gennady Sinitsyn has lost his wife—she was killed by an unknown villain whom the police never managed to catch. The situation takes an unexpected turn when someone kidnaps Gennady and begins blackmailing his brother, judge Semyon. The criminal’s messages consist of sequences of perfect numbers, and only an expert in the exact sciences can understand what they mean. Will Olga be able to figure out what game the blackmailer is playing and investigate several cases at once?
To find out how the events unfold, watch “Euclid’s Riddle” online on ivi.
