Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation. The title is a popular colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid.
Thou shalt not kill
Looking after our own
One last dance
Traitor's gate
The rose bed memoirs
The lesser of two evils
Legitimate targets
Nest of angels
Spiders
Blood and money
I spy apocalypse
Without incident
Clean skin
Strike force
The seventh division
Smoke and mirrors
Project friendly fire
The sleeper
Who guards the guards?
A prayer for my daughter
Love and death
Persephone
Outsiders
Celebrity
Frequently asked questions
The suffering of strangers
The special (1)
The special (2)
Divided they fall
Road trip
The book
The innocent
Syria
The russian
The sting
Diana
Gas and oil (part 1)
Gas and oil (part 2)
The cell
World trade
The message
Hostage takers (part 1)
Hostage takers (part 2)
Agenda
The criminal
Aftermath
The virus: part 1
The virus: part 2
The kidnap
The extremist
The deal
The courier
The broadcast
Infiltration
Isolated
The school
New allegiances
Split loyalties
The tip-off
A chance for peace
On the brink
Accidental discovery
The mole
Nuclear strike
Uranium
Energy
Tycoons
Nemesis
Sudden death
Bankruptcy
Start a war
Brink of war
Plymouth
Oil baron
Paroxocybin
Chinese prize
Hotel lockdown
Cybershell
Dead drop
Cat and mouse
Garden leave
Stolen laptop
Dirty bomb
Suicide bomber
Kidnap
Deportation
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