An ecoterrorist group has set up base in a secluded part of Yellowstone National Park with a plan to save the planet. Believing mankind is a virus that must be eradicated, the group has set in motion a plot to kill millions in seconds and leave the rest of the human race on the verge of extinction. Nothing will throw them off course--including any campers who try to stop them. But Mack Bolan isn't your average outdoorsman. Unarmed, with only his wits and nature on his side as the clock ticks down to a nuclear disaster, Bolan knows the best chance for saving countless innocent lives and averting a global crisis is through guerilla warfare. The terrorists may be on a mission to destroy man, but the Executioner has his own elimination objectives.