Six months after their last mission, three members of the British special-ops Section 20 team--Gracie Novin, Samuel Wyatt and Thomas "Mac" McAllister--are reunited for what they think is a routine "cleanup" exercise in Malaysia. Things get complicated when their new commanding officer, a borderline burn-out named Alexander Coltrane, learns that a British operative, in possession of intel about a downed Russian plane, has been killed in Kuala Lumpur after meeting with a covert Russian operative, Katrina Zarkova. The trail leads Wyatt, Mac and Novin to a Russian safehouse where Katrina and her team of Russian soldiers are attempting to track a mysterious "package" stolen from the plane, which crashed into the ocean under suspicious circumstances. The confrontation gets bloody when members of a brutal Malaysian triad arrive, setting off a chain of dangerous encounters in the skies and skyscrapers of Kuala Lumpur.

Section 20 forges an uneasy alliance with Zarkova in hopes of tracking down a nuclear warhead in Kuala Lumpur. High Commissioner McKitterick finds himself in an untenable dilemma, while Novin defies Coltrane's orders to settle a score.