Cleanskin

Ewan (Sean Bean), a former soldier-turned-secret-service-agent, must hunt down Islamic terrorists after they steal explosives from arms dealer Harry. His mission is off-the-books and isolated from the agency, but he's aided by an assistant, Mark (no actor mentioned in the plot summary). The story unfolds via parallel timelines, revealing what drives both Ewan and a young British student named Ash to their current courses of action.