Shelter

Former government assassin Michael Mason lives on an island in the Outer Hebrides off the coast of Scotland with his dog. Every week, Michael receives supplies from Jessie, a young girl grieving the loss of her mother. However, Jessie grows increasingly frustrated by Michaels' lack of respect and reclusiveness, given that her mother and uncle knew Mason but didn't tell her before her mother passed away.

A severe storm caused Jessie's uncle to leave; Jessie tries to catch up, but she falls overboard and sprains and lacerates her ankle before Mason saves her, leaving her marooned on the island after the storm capsized her uncle's boat, drowning him. Mason takes care of her, and while she recovers, they bond. Michael goes to the mainland to buy new clothes and medicine, but he accidentally attracts the attention of his former handler and MI6 Chief, Manafort, and his assistant and acting MI6 chief, Roberta, and the agency send a hit squad to eliminate Mason after he went rogue and leaked MI6's advanced surveillance system, THEA (Total Human Engagement Analytics) to asset and eliminate any threat to the country and refusing to kill a defecting foreign intelligence officer. In addition, Mason was an ex-operative of the Black Kites, an elite black-ops government kill team from MI6.

Michael kills the entire team using various booby traps he set up on the island and escapes with Jessie to a Scottish farm, where the farmer, Angus, greets them. In response Manafort sends in his lead assassin of Black Kite, Jack Workman, to kill Michael and Jessie to tie up loose ends. Angus's son Callum calls the police; Workman intercepts the call and kills Angus. Michael and Workman engage in a car chase before escaping from the authorities.

Michael and Jessie meet Michael's computer programmer and creator of THEA, Arthur Booth, and ask him for a safe passage for Jessie to escape to Spain, so he suggests Kamal, a human trafficker, before Workman attacks the safehouse, forcing Michael, Jessie, and Booth to escape. Soon after, Mason and Jessie go to a nightclub to seek shelter and to get Kamal to arrange a safe passage for Jessie. However, Manafort's Black Kite agents raid the club, but Mason kills them all and rescues Jessie, sending her on a boat to Spain before he is ambushed by Workman. Michael and Workman engage in close combat before Michael overpowers Workman and kills him.

Michael then goes to Manafort's private estate, killing his guards, and confronts Manafort. Manafort berates Michael for breaking the most important rule in Black Kites: loyalty, and that Michael broke the rule. Michael responds that finding his humanity after a life of obedience is why he is still alive before he shoots and kills Manafort.

Three months later, Roberta becomes head of MI6, and knows that, though they no longer want to kill Mason, they will still attempt non-lethal ways to recruit him back into the agency. Meanwhile, in Ronda, Jessie sits in a café and receives a chess piece from Mason, who overlooks her from a window. He leaves just as she turns around, and, knowing that Mason will protect her if his former agency returns and that he will always be with her.