Cryptic clues discovered in Major Jesse Marcel's journal spark an investigation into whether a UFO crashed at Roswell in 1947.

The family of Major Jesse Marcel continue to investigate his journal as they set out to prove that the US government forced him to deny he saw a UFO.

Jesse III visits a documents expert to prove that the handwriting in the journal belongs to Major Jesse Marcel. Also, crucial photo is examined.

The investigation continues with a visit to the crash site, where the grounds are thoroughly inspected. A body-language expert examines footage of Marcel.

Ben Smith gets a hold of an interview and hears Marcel's remarkable story in his own words for the first time in 39 years. A code-breaker examines the journal.

With enough evidence gathered, Smith shares his findings with Jesse Marcel's family and reveals what their grandfather saw on that fateful day in 1947.