Franklin W Dixon

When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

When Jack Dodd and his father are accused of stealing cars in Bayport, Frank and Joe work against the clock to prove their innocence while also searching for a lost treasure.

When Frank and Joe Hardy investigate a hijacking, they become involved with industrial spies and a pursuit into the Canadian wilderness.

The Hardy boys track down the saboteurs who kidnapped their father.

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

When Frank and Joe try to get hold of a top secret invention, they are put on the trail of jewel thieves and smugglers.

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

Frank and Joe are harassed when they try to locate a descendant of the Aztecs.

The Hardy brothers' visiting Greek pen pal enlists their help in searching for a priceless ancient Greek helmet loaned to and lost by a Hollywood movie company years before.

Frank and Joe go to the Pocono Mountains to investigate the mystery of a legendary witch who stalks Black Hollow seeking vengeance. Disappearances occur and strange screams fill the night.