During a UFO interception by Sky One, an experimental test plane crashes because it was too close to the explosion. The co-pilot is killed, but pilot Paul Foster survives. He tries to convince his boss and an investigator that he saw a UFO, but the evidence doesn't back up his story. He begins to investigate what he believes to be a cover up, aided by the sister of the dead co-pilot. His investigation leads him to Commander Straker, who agrees to meet with him. Will Foster have to be killed for knowing too much?