Major Michael Harrison discovers a dark secret: an invasion from another Earth, where resources are so scarce that its people are willing to raid other worlds to attain them, releasing enhanced bioweapons. Thus starts a war between worlds, between universes. Major Harrison is at the tip of the spear-point taskforce assigned to stop the war at all costs. He volunteers to take a nuclear weapon deep into the heart of the enemy's defenses. Harrison escapes the blast, and then his odyssey begins.