Trapped in death cave

"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
"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."
"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