Shelter

Former MI6 "Black Kite" assassin Michael Mason lives alone on a remote island in the Scottish Outer Hebrides. Every week, he receives supplies from teenager Jessie and her uncle, who Mason served with in the Royal Marines. When a storm kills her uncle and throws Jessie overboard, Mason rescues her and they bond as she recovers at his home.

Stephen Manafort, the Chief of MI6 and Mason's former handler, is questioned in a public inquiry about Total Human Engagement Analytics (THEA), an advanced surveillance program being investigated for illegal monitoring of British citizens. Prime Minister Fordham, who supports THEA, arranges for Manafort to be replaced by his deputy, Roberta Frost, so he can discreetly conduct black-ops outside of MI6's control. Mason is captured on camera buying supplies in Stornoway, but THEA identifies him as terrorist Timur Tchermoev, subject to a kill order. This prompts Frost to dispatch a tactical team, but Mason kills them using booby traps. Frost discovers Mason's true identity and that he has been in hiding for betraying Manafort after refusing to kill an Iranian nuclear program defector ten years prior. She learns that Manafort lied to her, saying Mason betrayed MI6; in reality, he was trying to protect the defector. Manafort had put Mason under Tchermoev's name to uncover him. He discreetly orders James Workman, another Black Kite operative, to kill both Mason and Jessie, despite Jessie being a civilian.

Mason and Jessie escape to mainland Scotland but are attacked by Workman. Fleeing from him, Mason takes Jessie to his friend Arthur Booth, the former MI6 systems architect who created THEA, believing he can safely leave her there and go into hiding again. However, Booth is dying from cancer and is unable to take care of Jessie. Mason decides his last resort is MI6 informant and human trafficker Kamal Shah. Workman attacks Booth's house, forcing the three to escape.

Mason and Jessie drive to Kamal's nightclub in the Isle of Dogs, London, to secure her safe passage. After warning Kamal that Manafort is no longer constrained by MI6 and poses a danger to them both, he agrees to give Jessie a new identity and move her to Spain on the condition that Mason kills Manafort. Mason kills Manafort's Black Kite operatives at the club, disarms Frost's team, and gets Jessie to the docks. Though she begs Mason to join her, they are ambushed by Workman; Mason gets Jessie on the boat and kills Workman after a brutal fight.

Mason confronts Manafort at his private estate for his actions and is berated for breaking the most important rule in Black Kites: unconditional loyalty. Mason responds that finding his humanity after a life of obedience is why he is still alive before shooting Manafort dead. Three months later, Roberta wishes to bring Mason in and has Jessie under surveillance. In Ronda, Jessie sits in a café and receives a chess piece from Mason, who is still in hiding. He overlooks her from the street before walking away.