1904: Reilly is stationed in Port Arthur and forced to help the Japanese, against his better judgement, in taking the port from the Russians. As a mass evacuation gets under way, Reilly’s plans are put at risk by a soft-spoken detective.

1905: A British operation to steal German ship plans is in danger of being uncovered. Zaharov wants the plans and Cummings wants a compromised agent saved, but Reilly decides on a unique approach to the problem.

1906: Reilly’s search for Margaret takes him to Paris, where Cummings forces him into helping secure an oil contract from an Australian who may sell to the Rothschilds. An unexpected turn of events reunites Reilly with his sister.

1918: Reilly and his friends filter back to Britain and face questioning from an official enquiry. As Lenin's condition becomes stable, both Reilly and Dzerzhinsky plan their next moves.

1924: Reilly is in exile in New York drumming up support and money for Savinkov’s anti-bolshevik movement. A new organisation, the Trust, campaigns for Savinkov’s return, but Reilly suspects that Dzerzhinsky is behind them.

1925: Reilly has been arrested and is subjected to interrogation and torture. Back in Britain, Pepita fights to find out the truth while Cummings campaigns for his release. As Dzerzhinsky’s whole operation is put under threat, a last minute deal is attempted.