Red Heat — Don Pendleton

RED STRONGHOLD

America's top missile scientist is poised to defect to North Korea, and Mack Bolan hits the streets of Seoul to stop him. But the mission goes sour, and the defector crosses the border, aided by a former KGB officer.

Joining forces with a Stony Man undercover operative, Bolan heads into communist North Korea, aware that American genius in the hands of the enemy could produce a nuclear arsenal that could hold the world hostage.
Hunted by the North's special purpose forces, Bolan pushes on, defying death and the odds, knowing that if this mission is his last, he's taking an army with him....