MysteryYoung Adult
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An urgent call for help from their father's friend, chemist Sam Gentle has drawn Frank and Joe across country to northern Arizona.
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Editions
3 editions- Other · English · 2001Simon & Schuster Books For Young Readers · 160 pages · 9780743404310
- Other · English · 1993Pocket Books · 153 pages · 9780671794651
- Other · English · 1993Sheer Terror (Hardy Boys Casefiles, No 81)Demco Media · 9780606058629
Juvenile fictionHardy Boys (Fictitious characters)Children's fictionMystery and detective stories