A chance meeting with a stranger on the road provides the Hardy brothers with a clue to a gang of local burglars.

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

While searching for the guard end of a broken saber that will solve one mystery, the Hardy brothers become involved with a gang of bank robbers.

In solving the mystery of two medallions missing from an inherited curio collection, the Hardys wind up in a desolate area of Guatemala at the mercy of dangerous thugs.

Suspecting that their friend has been swindled, the Hardy brothers investigate and find themselves on the trail of a much larger criminal operation involving the theft of an ancient Seneca artifact.

The Hardy boys find the missing deed to an Indians' land, prevent a phony salesman from carrying through a reckless scheme, and help their father solve a top-secret case.

Timber wolves, a Rocky Mountain blizzard, and a mine cave-in are only a few of the perils Frank and Joe Hardy encounter during their search for the principal members of a notorious gang responsible for a payroll robbery. Clue by clue, Frank and Joe cleverly fit into place the scattered pieces of this dangerous puzzle and come up with the astonishing solution.

Strange events involve Frank and Joe Hardy in a mystery which shrouds an ancient treasure?the golden head of the Pharaoh Rhamaton IV. The owner of the million-dollar golden Pharaoh?s head claims it was aboard the freighter Katawa, which sank not far from Whalebone Island. But suspicious developments indicate that Mehmet Zufar may be trying to defraud the shipping line?s insurance company. Frank and Joe enthusiastically accept the challenge of their...