Spooks, Ep 04

An assassin kills a retired spy and former colleague of Harry - then targets a Russian minister visiting the UK.

Calum is attacked by muggers who take his laptop containing classified information on MI5's undercover agents, leading to a race against time to save the spies from being exposed.

Dimitri gets close to the sister of a dangerous anarchist in a bid to discover where he is hiding, while Ruth considers an offer to become the Home Secretary's security adviser.

An imprisoned religious extremist leader sends two men on a suicide bombing mission, unaware one of them is an MI5 spy. Meanwhile, an attempt is made on Elena's life.

Harry kidnaps CIA deputy-director Jim Coaver and interrogates him about the recent attacks on MI5, but he soon realises his former Cold War colleague could be innocent.

Harry faces deportation by the CIA - but when Elena reveals information about an imminent attack on the UK, his colleagues decide to break him out of custody.