A powerful union activist disappears from a Detroit suburb. 45 years later, it remains one of the most notorious missing person cases of all time. The mystery of Jimmy Hoffa's disappearance features more twists and turns than a Hollywood movie, but the question remains: where is he?

As the Cold War ramps up, a well-dressed man is found dead within miles of a nuclear testing site on a tranquil Australian beach. There are no clues to his identity, or what could have happened. It's a case that's obsessed an army of sleuths for over 70 years: Who is the Somerton Beach man, and how did he die?