It’s one of Australia's greatest mysteries. On December 1, 1948, an unknown man was found dead on Somerton Beach in Adelaide. Nobody knew who he was or how he died, and 70 years on the case remains unsolved. Many people have tried to crack the case, and most have given up. But not Gerry Feltus and Derek Abbott. The lengths these two men have gone to trying to solve this mystery have led them to some seriously unexpected places.