Franklin W. Dixon

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

A series of bizarre events in their home town lead the Hardy Boys on a trail of robbers and kidnappers.

Timber wolves, a Rocky Mountain blizzard, and a mine cave-in are only a few of the perils Frank and Joe Hardy encounter during their search for the principal members of a notorious gang responsible for a payroll robbery. Clue by clue, Frank and Joe cleverly fit into place the scattered pieces of this dangerous puzzle and come up with the astonishing solution.

When the Hardy Boys eagerly agree to assist their friend Jack Dodd and his father in locating a family treasure, the two young detectives are unaware of the baffling complications that will arise. Deadly road traps, aerial ambush, a spider man and a suspect who carries a menacing cane harass the young detectives as they seek the triple solution to this perplexing and exciting mystery.

Falsely accused of a robbery at the airport, the Hardy boys turn the tables on the real thieves by nabbing them in the act of committing another robbery.

"Frank and Joe are off to the Florida Keys to work alongside Lookout Shark Lab's Dr. E. Ella Edwards, one of the world's foremost marine biologists. On their first evening, Dr. Edwards paddleboards out to check on a lemon shark nursery. But after a sudden squall rolls in, she doesn't return, and the next day her board washes up with a shark bite taken out of it. The Hardys volunteer to help the search and rescue efforts as panic sparks a rift in Lookout...

"Frank and Joe uncover a century-old mystery buried in a New York City prohibition museum."--

The Hardy boys go to the Pocono Mountains to help a friend of their father find out what is behind the mysterious happenings at Black Hollow, and in the process help their father solve a case involving a ring of thieves.

After Frank and Joe's friend Jason wins a map to the buried treasure of Captain Scurvydog, they investigate when Jason claims the ghost of the pirate has been haunting him and warning him not to dig up the treasure.

When the Sweet Sixteen party plans of a local rich girl are overshadowed by pranksters who key her expensive car and post a video of the act on the Internet, Frank and Joe resolve to identify the culprits.