In the last ever series of acclaimed spy drama Spooks, the team has been left reeling by Lucas North's betrayal, and with Harry Pearce on gardening leave, Section D has a new leader. Erin Watts is acting head and she has brought Calum Reed with her, a brilliant officer and technical genius.

However, Harry Pearce survives his MI5 employment tribunal and is quickly back on the Grid in the thick of the action. Buried secrets are unearthed when Max Witt, a retired spy and Harry's colleague in Berlin during the Cold War, is found murdered by an unknown assassin.

Meanwhile Ilya Gavrik, Russia's foreign ambassador and Harry's opposite number in the KGB for much of the Eighties, has flown into London to negotiate a ground-breaking strategic partnership between Russia and the UK.

Harry makes his feelings about the partnership clear, but Home Secretary Towers insists he put a lifetime of animosity behind him and make friends with the old enemy; a request made even more urgent when the killer of Max Witt now appears to be targeting Gavrik.

Episode 2

Calum is attacked in the street during a routine intelligence sharing exercise with MI6. His laptop is stolen containing highly classified information on MI5's undercover assets. The names are soon leaked, putting the assets' lives in danger, and it's a race against time to stop the next spy being exposed.

Episode 3

MI5 receive a red flash: radioactive material has been detected at an airport.

They have intelligence that a dangerous anarchist – linked to a previous bombing campaign – has entered the country. They enlist Dimitri to find out more by honey-trapping the anarchist's sister, Natalie. It's a morally tough operation, but he gets close to the dirty bomber and engages in a lethal game of cat and mouse.

The Home Secretary invites Ruth to dinner to discuss a role as his security advisor.

Episode 4

A controversial religious leader has his appeal for parole rejected and sends two recently released inmates on a revenge suicide mission. One of the inmates is Ashur, who has been passing on intelligence to MI5 while in prison.

Section D needs Ashur to gather Intel and he is committed to MI5 on condition that his daughter becomes a UK citizen. But things go disastrously wrong when his daughter is kidnapped by the bombers and used as collateral, putting Harry in an impossible position. Will he choose to save the life of an asset's daughter, or the lives of hundreds of members of the public?

Episode 5

With fresh evidence of CIA agent Jim Coaver's involvement in the recent attacks on MI5 and the government's proposed partnership talks with Russia, Harry kidnaps his former Cold War colleague – but his interrogation doesn't go to plan, as the spy thriller continues.

Harry soon realises that he's been looking in the wrong place and Jim is possibly the innocent party. But if so, where does the real villain lie?

On Jim's instruction, Harry, with the help of Ruth who is now working for the Home Secretary, sets out to steal Coaver's laptop from under the noses of the Americans at the US embassy to find out who really is behind the brutal attacks on Gavrik and the partnership. Will he succeed and what implications will this action have for Harry and the rest of Section D?

Episode 6

Harry is facing deportation to America after the death of CIA agent Jim Coaver, in an action-packed Spooks finale marking the end of the adrenaline-filled spy drama. But when fresh evidence surfaces about the recent attacks on the UK and the Government's proposed alliance with Russia, Ruth and her former colleagues in Section D break him out of CIA custody. Harry's suspicions lead him to another of his former Cold War adversaries. But events are soon thrown into turmoil when Elena Gavrik announces detailed knowledge of a planned attack on the UK. Can Harry trust her or is she playing the ultimate game of cat and mouse?

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BBC’s Spooks - Series 10 starring Peter Firth

Not a nine to five job, the spooks of Thames House

Starring Peter Firth, Lara Pulver, Geoffrey Streatfeild, Giles Havergal, Jonathan Hyde, Alice Krige & Tom Weston-Jones.

Photo shows Lara Pulver in character as Erin watts new acting head of Section D