Scars

The Park’s screens display a countdown as its staff struggle to recover the disabled systems. Tara calls through the Libyan ambassador, who is being held at gunpoint. She demands compensation and safe passage for the group, threatening an attack on a place of worship. With so many possible targets, the deadline makes the loss of MI5’s information systems immediately dangerous. Taverner has to decide what can still be done without the machinery on which her organisation normally relies.

Lamb identifies the likely gathering: the commemoration for Abbotsfield’s victims. River, Shirley and Coe head there while Taverner agrees to pay. Tara believes the settlement will allow the group to leave, but the men intend to continue. Their different aims become clear too late for her to control them. Lamb anticipates that she will be stranded at the embassy and uses Catherine to draw her outside, where the Dogs can take her into custody.

At the memorial gathering, the slow horses try to persuade Jaffrey to evacuate. The mayor’s insistence on checking their warning costs time. The attackers arrive and open fire before the building has been cleared. River and Shirley return fire, and Shirley kills one of the gunmen. The other seizes Jaffrey and uses him as a shield. The room becomes a hostage scene in which shooting directly at the threat would endanger the person they came to protect.

River and Shirley create a distraction by arguing. Coe moves behind the remaining attacker and kills him with his knife. The immediate assault is over, and MI5’s systems come back online. Those events make a convincing ending to the emergency, but they do not account for every member of the group. Another attacker has separated from the others. The apparent conclusion is exactly the moment at which an additional strike can catch its target unprepared.

River visits David and finally recognises the warning concealed in his grandfather’s talk about a sting in the tail. He calls Lamb, who identifies Whelan as the likely target because his file was taken from the database. River reaches the threatened First Desk and kills the remaining attacker. Whelan survives and responds with gratitude. For River, this looks like proof that his judgement and ability ought to earn a way back to the Park.

That hope meets the institution’s need for a scapegoat. Whelan intends to close Slough House and place the failures at its door. Lamb answers with the recording of Whelan threatening the Gimballs. He uses it to protect the office, restore Roddy and Molly, and force responsibility upwards. River remains where he is. Taverner takes the vacant First Desk position, and Lamb repairs a damaged sock. The camera reveals the scarred sole of his foot, leaving the season’s earlier story of torture beside physical evidence he never offered his colleagues.