Harry is reinstated to the Service but on the understanding that Erin Watts, the new Head of Section D, remains Section Chief under his command. Ruth's faith in Harry however becomes strained when faces from his past begin to return. Elena Gavrik and her husband Ilya Gavrik along with their son Sasha are on their way to the UK to sign a new partnership between Britain and Russia. It's revealed that Elena had been an asset of Harry's during the Cold War and that the Gavriks may need protecting. Later Harry finds evidence after a meeting with Sasha Gavrik that someone is impersonating him and asking Elena Gavrik for information about the Russian deal. He turns to Ruth for help, telling only her that someone had been contacting Elena posing as him. They attend the Russian reception giving Harry the chance to talk to Elena face to face, however Ilya Gavrik is then attacked by an unknown assassin. At the end of the episode Ruth asks Harry what exactly it is he is hiding from her. He reveals that he and Elena had been lovers and that Sasha Gavrik is their son.