Gateway is a sci-fi mystery about a young farmer from Kansas named Henry Wallace. After the tragic loss of his young wife and daughter, Henry's home plays host to a mystifying glowing orb, which appears one day in a cacophony of light and noise. Unable to determine the orb's purpose or origin, the experts and Henry are stumped. The truth is kept secret until one night a mystery old man, driving a beat up old truck, arrives at Henry's house, and changes both their lives forever.