Air date: May 22, 1938

An isolated island in the South Pacific is home to an even more isolated diamond mine. The mine is so cut off from the outside world that it doesn't even have a radio, and the only contact is the plane that leaves once per quarter to take away the diamonds.

A gang of thieves plans to take advantage of the mine's isolation. They will land their own plane, steal the diamond shipment, kill all the white men at the mine, and take off.

But they don't count on The Shadow.