Madge and Paul Franklin enjoy being retired. They also enjoy living full-time in their recreational vehicle and having adventures as they travel across America. The couple has been on the road as full-time RVers for over 6 years. Sometimes they travel as simple tourists, but often they work as volunteers with different organizations. Recruited by a semi-official government organization to work in clandestine operations, the Franklins find themselves RVing throughout the Southwest tracking a “mad” scientist suspected of killing people in fast food restaurants. The Franklin’s investigation takes them from White Sands National Monument in New Mexico to Virginia, back to New Mexico, and then to Death Valley National Park, where the murder mystery reaches its climax. Who is killing these fast food diners … if it’s not the calorie-laden food?