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.

In trying to trace a missing will, detectives Frank and Joe Hardy trap a dangerous criminal who is willing to risk all--including murder--for money.

The Hardy brothers' search for the missing son of a wealthy industrialist leads them to Brazil and great danger.

When they journey to Alaska to help a friend who feels his life is in danger, the Hardy brothers find their own lives threatened.

Their efforts to recover a stolen ancient chess piece lead the Hardy brothers to Hong Kong where they help smash an international criminal organization.

On a winter vacation in Jamaica the Hardy boys begin a dangerous adventure when an ancient bronze death mask is discovered near their beach house.

The search for missing gold takes the Hardy boys to the Yucatan Peninsula where they uncover a second mystery.

During their father's investigation of a ruthless gang of terrorists, two young detectives face several adversaries.

Valuable antique weathervanes are being stolen in the Pennsylvania Dutch country. A Navy employee removes a top secret document from the Pentagon. The Hardy brothers try to solve these two seemingly unrelated mysteries.

Frank and Joe Hardy are drawn into a tangled web of danger when they are called in to investigate mysterious accidents plaguing a college football star.