Harry kidnaps and interrogates his CIA counterpart (William Hope) in hopes of confirming CIA complicity in the assassination attempt on the Russian emissary. Later, he and Ruth infiltrate the U.S. Embassy in an attempt to steal a notebook computer that contains sensitive information.
Harry kidnaps his CIA counterpart, Jim Coaver, and interrogates him. What Harry discovers alters his suspicions of who is behind the attacks on the Anglo-Russian partnership, but is it too late to save his friend from a brutal end?
The team works to stop a suicide-bomb plot by two released prisoners, one of whom is an MI-5 asset. Elsewhere, Harry comes across additional evidence indicating CIA involvement in the assassination attempt on the Russian official; an attempt is made on Elena's life.
Two former inmates are released from jail. One is an undercover MI-5 asset and the other is an impressionable wannabe suicide bomber who has been radicalized in prison. They plan to launch an attack in London...can the team prevent a massive loss of life?
An anarchist may be building dirty bombs; the intelligence theft is linked to an assassination attempt on the Russian ambassador. In other events, the home inspector asks Ruth to become his security adviser.
A radioactive material has been detected at an airport. MI-5 has intelligence that a dangerous anarchist with a penchant for bombs has secretly entered the country. They enlist Dimitri to honeytrap the anarchist's only known contact, his sister Natalie.
Calum is attacked by muggers during an intelligence-sharing exercise with MI-6. The laptop he was carrying is stolen, and contains classified info on MI-5's secret assets. It's a race against time to stop British spies being exposed and lives being lost.
The series' 10th and final season opens with a former colleague of Harry's murdered. In other events, Harry is suspicious of an old KGB rival, who's in London to coordinate a strategic partnership between the U.K. and Russia.
Harry survives his MI-5 work tribunal and is back on the Grid, where changes have been made: Erin Watts is the new acting head of Section. When a face from Harry's Cold War past returns it provides an early test for the new team.
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