No human can go forever without respite. But even on well-earned R&R in the pristine wilderness, Mack Bolan is again called to the howling hellgrounds of justice and death.

Through the steep-walled canyons of Idaho's River of No Return, Mack kayaks with a woodsman who bears an uncanny resemblance to his younger brother, Johnny. The turbulent white water is a challenge to them both. But the crazed slaughter-squad that pursues them is a far more stunning terror.

It is wrenching agony for Bolan as he is forced to make the younger man the hunter, not the prey!