Franklin W Dixon

The Hardy brothers interrupt their investigations of jewelry-store holdups to answer a plea from their cousin on a New Mexico cattle ranch.

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 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.

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...

Helping in a case their father is working on, the Hardy brothers try to find an informer who has telephoned from a booth in their home town, and are hired by a carnival owner to spot pickpockets.

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

Frank and Joe attempt to foil a ruthless espionage ring in their effort to sabotage the United States space program.

In two separate cases Joe and Frank Hardy search for stolen jewels to prove a man's innocence and attempt to catch a gang of drug smugglers.

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