Episode Overview
Lamb liaises with a Russian defector who may hold a clue to sleeper agents. River is on the trail of a ruthless assassin.
Guest Stars
Saskia Reeves
Catherine Standish
Christopher Chung
Roddy Ho
Rosalind Eleazar
Louisa Guy
Aimee-Ffion Edwards
Shirley Dander
Freddie Fox
Spider Webb
Dustin Demri-Burns
Min Harper
Kadiff Kirwan
Marcus Longridge
Rade Šerbedžija
Nikolai Katinsky
Colin Mace
Kenny Muldoon
Zahari Baharov
Piotr Volodin
Yerden Telemisov
Kyril Asimov