Franklin W. Dixon

The Hardy brothers try to find out who is behind a rash of automobile thefts that are occurring on Shore Road just outside of Bayport.

"Drop case or else danger for you and your family." This warning addressed to Fenton Hardy not only alarm the famous investigator and his detective sons, but also puzzles them, because Mr. Hardy is working on more than one case. Which one prompted the threat? When more ominous warnings follow, Frank and Joe suspect there is a link between the counterfeiting case they are investigating and a secret case their father cannot discuss since it involves...

Teenage detectives Frank and Joe Hardy investigate a supposedly haunted house reported to be the hangout of criminals.

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.

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.

Frank and Joe try to determine the cause of recent injuries and deaths at a camp for troubled teens in the wilderness surrounding Moosehead Lake in Maine.

Frank and Joe travel to New Jersey where they investigate a series of robberies at jewelry stores. In Boardwalk Bust, Frank and Joe head to Ocean Grove, New Jersey, to investigate a rash of jewelry store robberies. The temperature's sizzling; will the boys be able to smoke out 'sticky fingers' before they're burned? Mission: Investigate and put a halt to the recent rash of jewelry store robberies. Potential danger on the ground and in the air. Location:...

While Frank and Joe help their father locate a notorious jewel thief, they also explore the mysterious death of a tycoon's nephew years before.

The Hardy brothers embark on a freighter trip under mysterious circumstances and find themselves involved with a smuggling ring.