Books in Hardy Boys Mystery Stories series

slightly different cover/ no marks/ cover wear

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Participants in a traveling baseball camp, Frank and Joe must put aside their bats and gloves to investigate the sinister goings-on that suddenly strike the camp.

The Hardy brothers travel to an Arizona ranch and eventually, Thailand in pursuit of jewel thieves who have stolen a priceless ruby.

Hardy Boys 54: The Mysterious Caravan (Hardy Boys (Hardcover) #054) [ Hardy Boys 54: The Mysterious Caravan (Hardy Boys (Hardcover) #054) by Dixon, Franklin W ( Author ) Hardcover Jan- 1975 ] Hardcover Jan- 01- 1975

The questionable relationship between a sinister religious cult called Noah's children and a double of a popular television star, the Apeman, leads to trouble for the town of Bayport

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While their pal Chet Morton trains to become a clown at Bayport's Circus University, Frank and Joe Hardy decipher a coded message that reveals a deadly plot to sabotage the circus

The Hardy boys become involved in two mysteries when they attempt to track down a jewel thief and solve the intrigue surrounding an old estate

The Hardy brothers go to Big Thicket, Texas, to investigate attempts on the life of a naturalist trying to preserve the area wildlife in the face of threats from timber and oil interests.

Vacationing in Germany, Frank and Joe Hardy become intrigued by the sabotage of an inventor's miniature sub and the theft of five priceless medieval paintings

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