Books in Hardy Boys Casefiles, No 23 series

When Frank and Joe Hardy set out to catch the elusive prankster who is after rancher Roy Carlson's oil-rich land, the amateur sleuths find themselves struggling to survive in a vast New Mexico desert

Helping a friend move into his dorm, Frank and Joe Hardy are astonished when the friend's roommate is kidnapped at the height of a campus war involving eco-terrorists and a visiting American diplomat. Original.

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Falling for the pretty new chemistry teacher at Bayport High, Joe Hardy is called upon to clear her name when she is charged with murdering her former supervisor by deliberately mislabeling an important chemical. Original.

When their friend is aggressively targeted by two colleges that want him for his basketball talents, Frank and Joe find themselves in the middle of a deadly mystery when Bayport U's basketball coach is murdered. Original.

While studying at Oxford University for the summer, Frank and Joe Hardy discover the perils of international relations when their new friends, Soviet twins Pyotr and Petra Zigonev, are kidnapped to force their father, a Soviet peace negotiator, to sabotage the arms talks

While attending a comic book convention in San Francisco, Frank and Joe witness the kidnapping of celebrated publisher Barry Johns--an event they dismiss as a publicity stunt until someone destroys a priceless art collection

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The Hardys investigate on land and sea when Angus McCoy, a former world champion race car driver, crashes into Barmet Bay during the Bayport Grand Prix

Frank and Joe agree to help professional wrestler Sammy "The Kung Fu King" Rand when he is the victim of a series of "accidents," and the brothers are soon squaring off against the likes of Tomahawk, the Constrictor, and Major Disaster

While enjoying a teen tour of Greece, Frank and Joe discover that their tour guide is on a mission to rescue a Western agent from Yugoslavia, and when they become involved, and a friend is kidnapped, troubles abound

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