It's a race against time as Martin searches for Kate in Paris. He's convinced the peaceful protest she's attending may turn violent at the hands of her friend Ifti, a boy with radical beliefs. In 2001 Prague, Dmitry discovers that the key to getting close to Doku Zakayev may not be his brother Tamir, but instead Doku's wife, Ilyana. In 1991 Lithuania, a younger Ballard is involved in an incident that will affect the rest of his life.

In present day Paris, Nina and MI6 agent Simon Hardy offer Kate a deal that Martin doesn't like, but Martin may not have a choice. Ballard convinces the FBI to let him take down Martin. In 2001 Prague, Dmitry enlists Ilyana as an MI-6 operative and gives her an assignment. In 1976 England, we learn that Terrence has a secret life.