A story about CHeKa operation against a foreign spies during the early years of Soviet Russia.
The series is about the operation code-named "Trest", which under the leadership of F.E.Dzerzhinsky was carried out by the VChK to identify and eliminate the counter-revolutionary and monarchist underground on the territory of the USSR, associated with foreign white-emigrant organizations.
In May 1808, the fortress, renamed Sveaborg, surrendered to Russian troops and, together with the fleet and fortifications, went to the Russian Empire.
