America's top-secret prototype helicopter - a flying arsenal of high-tech death - is maneuvering for a test kill when the aircraft suddenly erupts into a fireball. Sabotage is suspected, but the evil mole is well hidden. Mack Bolan goes undercover as a Pentagon colonel to find the traitor, but a killer's stiletto and a brutal double murder tell the Executioner there's more at stake than electronic warfare secrets. Soon he's on a terrifying fast track of death, leading from a beautiful assassin to the boss' boss - a man who's very dangerous and very foreign. When they try to kill Bolan again, he decides his role camouflage isn't doing the trick. It's time to drop the hammer.