SHEER TERROR (HARDY BOYS CASE FILE 81) (Hardy Boys Casefiles)

An urgent call for help from their father's friend, chemist Sam Gentle, has drawn Frank and Joe across the country to northern Arizona. The cryptic message offers no clue to the danger he's in, and it's one secret he will never reveal. For when the Hardys arrive, they discover Sam's been the victim of murder. . . .