
Max Easton, a retired Secret Service operative and member of elite British/America team called The Section is coaxed back into the field to try to shut down an Iranian missile program. The situation is complicated by Max's estranged son, Harry, who has followed his father into the espionage world and as the series opens may have died in the line of duty.

Ex-spy Max Easton is brought out of retirement against his will by George White, London chief of MI6/CIA team 'The Section'.

In Washington, we meet the CIA's Amanda Jones. Max, now in Beirut, doesn't know who to trust after speaking to Leyla, a member of The Section team there.

When Amanda Jones arrives in London she brings the full force of CIA dissatisfaction to bear on White, who struggles to retain control.

Anna and her brother struggle to protect her daughters in France. Alexander Said, who led the team in Tehran, arrives in London, but The Section head is in no mood for forgiveness.

Leyla investigates links between Iran and the US. In France, White and his second-in-command Khalid Walker use Anna to leverage pressure on Max. This drives Max back from Beirut to the Pyrenees, where matters come to a head.

Max is reunited with his family, but danger is not far behind. He travels to London and finally manages to get to White. In Tehran, Leyla meets a US envoy who provides her with yet more clues related to the orders her unit were given.

In London, Max's digging stirs the attention of a sniper with a fatal point to make. In Washington Jones sends out a crack team to recover scientific evidence from an Iranian desert nuclear facility - the net is closing in.

Max heads to the US and may have finally discovered the real reason why the Tehran unit found themselves on The Section's hit list. Although he may have won the battle, he now has to work out if he can stop the war.

In Mali, four US Special forces and a translator are supposedly killed in an ambush.

Miller, along with Amanda Jones, flies to Mali to contain an increasingly unstable situation.

Harry and Leyla learn from Aïcha that this has all been about arms smuggling from within the Malian government.
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True to her word, Aminata Sissoko reunites Aïcha with her family, but as she does Harry and Leyla are arrested on murder charges.

Harry, Aïcha and Leyla are chased out of Bamako and driven, out of necessity, to return to Al Moctar's camp. In the search for the trio, Jones reveals the Collins tape to Miller, who is furious. He returns to Washington where he goes above Kingsley's head to Hal Weaver, the man behind the deep state, to work out how to nullify it.

With Aïcha close to danger, Harry must act quickly. He convinces Al Moctar to hold off on any action, and realizes that the deep state may be pulling away from him.

On the trail of their breadcrumb, Harry, Leyla and Aïcha do some more digging. Leyla and Aïcha manage to get away, but Harry is arrested.

Finally, all the pieces of the puzzle come into place, and the connection between the arms trail and the deep state is laid bare.