Franklin W Dixon

Joe and Frank suspect there is a link between the counterfeiting case they are investigating, and the case their father can't discuss. Determined to learn the secret, the Hardy Boys get themselves into a scrape.

Frank and Joe solve a dangerous mystery involving a payroll robbery, a mine cave-in, a piano-playing ghost and a booby-trapped helicopter.

Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, and international spy ring, and a Scottish castle.

Based on the 1929 original edition: “The Secret of the Caves”. When Frank and Joe try to help their father locate Miss Todd's missing brother, they find themselves tangled up with a mysterious hermit named Captain Royal.

Young detectives Frank and Joe Hardy get entangled with a band of Native Americans and a smuggling operation while searching for a stolen boat in Mexico.

Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures.

The Hardys purchase a Chinese junk to use as a ferry service, in order to make some money over the summer. It soon becomes apparent that others are very interested in the ship.

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

Private investigator Fenton Hardy enlists the aid of his teenage detective sons in a search for a missing man being sought by an insurance company. All leads to the sailor’s whereabouts have petered out and the boys fly to Iceland, the man’s native land, hoping to find a new clue. From the moment Frank and Joe arrive in Reykjavik, the capital city of Iceland, they are in constant danger.  In the spine-chilling pursuit that follows,...