After a dying criminal confesses that his loot has been stashed "in the tower", the Hardy boys make an astonishing discovery.

The Hardy Boys suspect a link between a counterfeiting case and mysterious activity at an old mill.

It's a case of hidden identities for brother detectives Frank and Joe in the in the eighteenth book in the thrilling Hardy Boys Adventures series. The Hardy brothers and Frank's new girlfriend, Jones, are attending a local comic book convention on the shore. They meet up with Jones's friend Harper, a fellow comics super fan, on the boardwalk outside the convention. The four of them spend hours running from booth to booth and end the perfect day with...

The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor.

Their SOS ignored in a storm, the Hardy boys find a wallet containing two thousand dollars alongside their boat and are launched into a mystery involving diverse clues.

When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.

Law enforcement is basically a means of deciding on a fitting course of action in times of need. Much of the work involved means doing it under pressure and that is not always an acquired trait. Teenagers Joe and Frank Hardy had ample mental ability to reach conclusions and act accordingly. Some of that ability was handed down by their former police detective Fenton Hardy, and the overall concept was enhanced by their perceptive cleverness. If you...

Called in to investigate the theft of some statuettes stolen from the Eygptian Museum in New York, the Hardy brothers become involved in a deepening mystery which includes the possible overthrow of another country's government.

The Hardy boys embark on another puzzling mystery when they try to discover who is stealing rare collections of ancient pirate treasure and smuggling them out of the United States.