Guest Stars Daniel Ryan as DAC Peter Clarke Barry Sloane as DS Jim Dawson Mark Ivanir as Alexander Goldfarb Richard Pepper as DCI Duncan Ball Kayla Meikle as DC Deborah Maxwell Kirsten Foster as Jenny Hyatt Temirlan Blaev as Young Anatoly Litvinenko Sam Troughton as DI Brian Tarpey Marcus Onilude as Aidan Nikolai Tsankov as Boris Berezovsky Selina Cadell as Louise Christian Stephen Campbell Moore as Ben Emmerson QC Brian Protheroe as Sir Robert Owen Greg Kolpakchi as Oscar Enrique Kevin Shen as Robin Tam QC James Esler as Older Anatoly Litvinenko
