Franklin W. Dixon

While on a relaxing safari vacation to Nairobi, Frank and Joe Hardy become involved in finding the culprits responsible for killing innocent animals for their tusks and skins.

WILL THE HARDYS CRASH AND BURN IN THE JEWEL RIDGE AIRSHOW? Attending an airshow to help out their friend Jamal Hawkins and his dad's air taxi service should be a nice break from the normal grind for Frank and Joe Hardy. But when one of the Hawkinses' planes is mysteriously stolen -- starting a whole wave of crime at the event -- the vacation ends, and the hunt for clues begins! The brothers' investigation takes them from the airport runway to the nearby mountains, and even into the clouds. Who, or what, is behind the trouble? Could it be one of the exhibitors, a jealous rival, or a former hotshot pilot? The crooks' plans are really taking off -- can the Hardys ground these guys for good?

AN ANCIENT HIDDEN TREASURE STIRS UP A CUNNING PLOT! Teen Village International brings Frank and Joe to the south of France to rebuild a deserted town. The finished project will be a center for refugee children. But word is that the local castle is haunted -- by the centuries-old ghost of its lord, who hid a fortune in diamonds from bandits within its thick stone walls. Spooky lights, strange noises, and several close shaves convince the Hardys that someone is trying to sabotage the project. A pair of French twins, descendants of the owner, want to save the castle from developers. Every facet of the case leads to a dead end -- and the Hardys are hunting a desperate enemy!

Hiking the Appalachian Trail with their friends, Chet, Phil, and Biff, the Hardys hit a snag when daredevil Biff gets hurt. The old mining town of Morgan's Quarry is the nearest place for help. But even the run-down, isolated town turns menacing when two tough locals drop a bag full of money in front of the brothers! Joe and Frank are stonewalled when they ask about the money. The roads are washed out, the phones are down, and a crumbling mansion hides a gold mine of secrets. Every fork in the road leads to more danger...and everyone in Morgan's Quarry seems bent on makng sure the boys don't make it out alive!

Joe's new love interest gets a rough welcome to Bayport - her car tyres are slashed and her mum's business is attacked. Frank and Joe are not about to stand by and see this happen, they go after the attacker...

The Hardys get a call for help from their friend Phil Cohen: seems his cousin, a project manager at a software company, can’t find Steven Royal, the eccentric designer of the company’s popular Chaos games. Is his disappearance a move in a deadly real-life game?

Asked to judge the sleuthing skills of five teen detectives participating in a contest aboard a Caribbean cruise ship, Frank and Joe must join the caper when mysterious pranks turn deadly and threaten the lives of the contestants.

JOIN FRANK AND JOE... On a deserted country road, where, a fiendish scarecrow walks and talks and stalks its victims! On a stromy night at sea, where the Hardys' only hope of rescue is an l8th-century whaling ship piloted by a ghostly, crew! In the dank, dark dungeon of a Scottish castle haunted by its first lord, a cruel and notorious pirate! WHEREVER DANGER LEADS... THE GHOST-HUNTING HARDY BOYS ARE SURE TO FOLLOW! Don't be alarmed, there is no such thing as a ghost -- or is there? Who knows what unseen powers lurk in the darkness? Frank and Joe are about to find out as they face some of their most challenging cases ever -- six startling journeys into the heart of mystery and fear...

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.

Caught in their motorboat the Sleuth by a sudden storm at sea, Frank and Joe Hardy are relieved to see the lights of a yacht. But their SOS ignored. The shrill sound of a siren fills the night air and moments later a helicopter drops an object alongside the Sleuth: a wallet containing two thousand dollars The next day, a truck carrying a shipment of high-powered rifles has been stolen. These two apparently unconnected events are clues in a tangle of mystery which turns out to be one of the detective brothers' most exciting adventures.

Difficult assignments are nothing new to the Hardy boys and this one that takes them to the Deep South is particularly challenging. Their mission: to vindicate a long-dead Confederate general, disgraced during the Civil War because he was accused of stealing hidden gold belonging to a bank. Skillfully avoiding booby traps and flying bullets, the boys persevere in their perilous quest. The arduous search is full of surprises that will thrill all fans of the Hardy boys.

With only the slender clue of an arrow-shaped tie clasp, Frank and Joe Hardy pick up the trail of a cunning gang of thieves responsible for a wave of jewelry-store holdups. But their investigations are interrupted when a desperate plea for help comes from their widowed cousin who lives on a cattle ranch in New Mexico. Frank, Joe, and their pal Chet fly there immediately, and manage to put an end to the trouble at the ranch and solve the jewelry-store robberies.

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

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

When thieves hijack a collection of stuffed animals from a country auction, Frank and Joe Hardy pursue the getaway car and are drawn into a thrilling mystery. At the same time, the young detectives' father--famed private investigator Fenton Hardy--is tracking down an industrial spy ring. This suspense-filled story of pursuit and detection will keep the reader breathlessly following the chain of unexpected developments that lead Frank and Joe to the spine-tingling climax in the wilds of Northern Canada.

Suspecting that their friend has been swindled, the Hardy brothers investigate and find themselves on the trail of a much larger criminal operation.