Rifts: Contamination Principle

From publisher blurb: A Special Exploratory Team for the Tomorrow Legion, on patrol in the Oklahoma Territory, hears a short range radio signal crackle over their equipment. A man’s voice fades in and out through the garbled transmission: “…sighted Xiticix…Red River…before it’s too late…Valiant…” Then the broadcast ends. Just how far will you go to be a hero to the town of Valiant?