The series follows the grandchildren of Major Jesse Marcel, the first person to investigate the wreckage. The investigation is being led by Ben Smith, a former CIA operative. The family believes Major Marcel was forced by the U.S. government to deny he ever saw a UFO. The family possesses a diary found in the belongings of Major Marcel, which may contain coded clues to the truth of what happened at Roswell. The investigation follows a compelling trail of evidence that leads from the Roswell crash site to new revelations that key U.S. Army officers believed it was truly a UFO incident. We will also attempt to decode the diary for the first time.