One night, innocent games of pirates and Robin Hood turn serious when the boys witness a murder in the graveyard. The murderer will kill them if they tell the truth. What should they do? The boys decide to search for the murderer's treasure. What risks will they take? Who else will they endanger? Will they have the courage and quick thinking to escape from dark caverns, cross the mighty Mississippi, and outwit the criminals? Will they find what they are looking for?