Franklin W Dixon

When signs of vandalism begin to appear at the Morton family farm, Chet and Iola Morton are worried that their grandparents are in danger, and with their parents away, they ask Frank and Joe Hardy for help.

On an ice-bound, snow-covered island, Frank and Joe attempt to solve the mystery of a boy's disappearance and the theft of a priceless collection of antique medals.

Frank and Joe solve a mystery involving the disappearance of a professor, a hot-tempered hermit, sabotage at the new Bayport Coastal Radar Station, and the Honeycomb Caves.

After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.

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

Teenage detectives Frank and Joe Hardy investigate a case of counterfeiting.

When a crime syndicate takes over Bayport's reservoir Frank and Joe Hardy help their detective father solve the sinister mystery.

The Hardy boys mystery stories series, bk. 13.

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment Company's cargo planes, and Frank and Joe Hardy are called upon to assist their world-renowned detective father to solve the baffling case. At Stanwide the boys pose as employees, and become suspicious of their boss's hostility toward them. Is he involved in the racket? And what is the truth behind the plane crash at sea in which Clint Hill,...