Many treasures of gold, silver and precious stones lie buried in various parts of the world. Fortunes have been gained on successful treasure hunting exercises, and fortunes have been lost. But the lure for lost loot still beckons men on as it always has. Many years ago, in the time of the old paddle steamers,  there lived a sea captain Stan Matthews. For many years he sailed his ship, the Skylark, from the Gulf to South America and back. It was at the start of one of these trips, that he met an interesting couple from the southern continent, who were to be passengers on his ship...