Cleanskin

Harry and Ewan travel to a bank with a Semtex briefcase. Ash and Paul shadow them; Ash incapacitates Ewan, kills Harry, and takes the briefcase. Ewan manages to shoot Ash in the arm before losing consciousness.

Ash sews the stolen Semtex into a jacket and gives it to Adel, who detonates it at a popular London restaurant. The attack demonstrates the reach of the terrorists and the first use of the explosives. Ewan is assigned to an off-the-books mission to counter them, with rookie Mark as his aide.

Ewan is tasked by two SIS superiors to pursue the terrorists in a covert operation. He is joined by rookie agent Mark. He interrogates Rena, who reveals that Paul paid her for information about Harry and to unload his gun.

At Paul's residence, Ewan and Mark attempt to capture him. Paul kills Rena, but Ewan shoots Paul, ending that thread of the pursuit.

At a cafe, Ash sees his former lover Kate. A series of flashbacks reveals his recruitment six years earlier by Nabil's anti-Western student group and his radicalization with Yussif. The flashbacks show Ash's transformation and his early acts of violence.

In the present, Ewan and Mark are sent to an abandoned building believed to house a terrorist. Ewan confronts the man; the prisoner begs for mercy, but Ewan burns him to death.

While searching, Ewan takes the man's jacket. They reach a housing estate where Ash and another bulky-jacketed man are spotted; the unknown man runs and Ash escapes on a motorcycle. Mark pursues and shoots the man dead.

Charlotte informs Ewan and Mark that the SIS has learned of their covert operation and is actively hunting them. The pursuit tightens as the agency closes in on the rogue activists.

During a hotel stay, Mark breaks in and tries to kill Ewan, but the attempt fails and Mark dies in the ensuing fight.

Isolated, Ewan resolves to end the terror cell. Using Mark's earpiece, he discovers that Mark's allies are helping to facilitate the next bombing.

Ash spends time with Kate. He then leaves her behind to embark on a final suicide mission, signaling his ultimate commitment to the cause.

Nabil tasks Ash with killing the head of a pro-Iraqi War think tank at his daughter's wedding in London. Ash records a video explaining his reasons and justifying his planned suicide attack.

At the wedding reception, Ewan confronts Ash; they fight and Ash is wounded but escapes. Later, Ash, in a waiter disguise, makes his way toward the head table, but Ewan shoots him dead. Meanwhile, a luggage bomb detonates in the hotel lobby, killing Nabil's targets when the bomb is triggered.

In the epilogue, Ewan finds a safe deposit box key in the jacket of the man he killed earlier. He discovers a folder and video camera identifying Hussein Malik, an undercover SIS agent. Ewan deduces that Charlotte engineered Malik's death, the assassination attempt, and framed Scott for corruption to cover her tracks. He confronts Charlotte at her countryside mansion and kills her, framing her death as a suicide.