As Maggie risks her job to help fly an activist to a disarmament rally in London, Kate is called upon by the CIA for a mission designed to protect the identities of several western spies. Meanwhile, Ted takes Colette to visit his childhood home.

Kate is ordered to track down a missing Russian double agent during a trip to Moscow, while Dean copes with the sudden return of his fiancée Bridget. Meanwhile, Maggie struggles to balance her liberal politics with her feelings for a pro-war politician.