"Buried treasure Fiction." . . "A posthumous letter referring to buried treasure convinces Gary that his grandfather did not die a natural death and, with his friend, Brian, he sets out to find both the treasure and his grandfather's killer."@en . . "Trapped in death cave"@en . . . . . "Mystery fiction" . "Mystery fiction"@en . "Trapped in Death Cave" . "Trapped in Death Cave"@en . "Fiction" . "Fiction"@en . . . . . . . . . . . . . . . . . . . . . . . . . "Detective and mystery fiction"@en . . . . "Juvenile works"@en . . . "Juvenile works" . . . . . "Everybody but Gary thinks grandpa died in a fishing accident. GAry is sure he will find the million dollars in gold as well as grandpa's killer, but treasure hunting can be deadly."@en . . "A posthumous letter referring to buried treasure convinces Gary that his grandfather did not die a natural death and, with his friend Brian, he sets out to find both the treasure and his grandfather's killer."@en . "A posthumous letter referring to buried treasure convinces Gary that his grandfather did not die a natural death and, with his friend Brian, he sets out to find both the treasure and his grandfather's killer." . "Mystery and detective stories." . . "Treasure hunting Fiction." . . "Treasure troves Juvenile fiction." . . . . "Detective and mystery stories Juvenile literature." . . "Adventure Fiction." . . "Adventure fiction." . "Detective and mystery stories. Juvenile fiction." . .