Hardy Boys 30: The Wailing Siren Mystery

Hardy Boys 30: The Wailing Siren Mystery
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 193
Release: 1951-01-01
Genre: Juvenile Fiction
ISBN: 1101076445

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.

Hardy Boys 20: Mystery of the Flying Express

Hardy Boys 20: Mystery of the Flying Express
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 193
Release: 1941-01-01
Genre: Juvenile Fiction
ISBN: 1101076348

A sleek new hydrofoil is scheduled to start ferrying passengers between Bayport and Cape Cutlass. But business enemies of the hydrofoil owner have stirred up a hornets’ nest of violent opposition among small boat owners. Fearing sabotage, he begs Frank and Joe Hardy to guard the Flying Express on her maiden trip. Startling developments plunge the teenage detectives into a dangerous chase by sea, air, and land in pursuit of a gang of hardened criminals who operate by the signs of the Zodiac. Tension mounts when the Flying Express vanishes – and so does Sam Radley, Mr. Hardy’s skilled operative. Peril stalks Frank and Joe’s every moves as they hunt down the terrifying gangleader Zodiac Zig and his vicious henchmen.

Hardy Boys 08: The Mystery of Cabin Island

Hardy Boys 08: The Mystery of Cabin Island
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 192
Release: 1929-09-01
Genre: Juvenile Fiction
ISBN: 1101076232

With two mysteries to solve, Frank and Joe must climb aboard their iceboat the Sea Gull to reach Cabin Island, where a belligerent stranger orders them off. Sabotage to the boat, danger to themselves, and a ghostly prowler do not daunt the Hardy boys in their search for Johnny Jefferson and for clues to stolen antique medals. How the teenage investigators outwit a ruthless foe and succeed in solving both mysteries makes for mounting suspense in this brisk-paced adventure.

Hardy Boys 43: The Mystery of the Aztec Warrior

Hardy Boys 43: The Mystery of the Aztec Warrior
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 193
Release: 1964-02-01
Genre: Juvenile Fiction
ISBN: 1101076569

The handwritten will of a deceased world-traveler is strange and mysterious. Its cryptic instructions are to deliver “the valuable Aztec warrior to the rightful owner, a descendant of an Aztec warrior.” Frank and Joe Hardy have only one slim clue to work with: the name of a complete stranger who can help. Despite the harassments, the threats, and the attacks made upon them, Frank and Joe unravel clue after clue in their adventure-packed search for the living descendant of the mighty Aztec nation which once ruled in Mexico. It takes as much high courage as clever deduction for the young detectives to defeat their ruthless foes and to decipher the fascinating secrets of the strange and mysterious will.

Hardy Boys 39: The Mystery of the Chinese Junk

Hardy Boys 39: The Mystery of the Chinese Junk
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 193
Release: 1959-12-01
Genre: Juvenile Fiction
ISBN: 1101076526

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.

Hardy Boys 36: The Secret of Pirates' Hill

Hardy Boys 36: The Secret of Pirates' Hill
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 193
Release: 1957-01-01
Genre: Juvenile Fiction
ISBN: 110107650X

In a series of hair-raising adventures both on land and undersea the teenage brother detectives pit their wits against some of the most ruthless criminals they have ever encountered. It all starts when Frank and Joe are skin diving just for fun and the thrill of exploring the undersea world. Suddenly, deep in the waters that flow near the foot of Pirates’ Hill, a mysterious skin diver fires a spear through Frank’s air hose. From this moment on, danger is never far away. The very lives of the boys are at stake as they, along with the help of their pals, uncover a mystery involving an old Spanish cannon and a fabulous sunken treasure.

Hardy Boys 45: The Mystery of the Spiral Bridge

Hardy Boys 45: The Mystery of the Spiral Bridge
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 193
Release: 1965-12-01
Genre: Juvenile Fiction
ISBN: 1101076585

Frank and Joe Hardy are determined to bring to justice the vicious criminals who kidnapped their detective father while he was investigation sabotage of a road-building project in the Kentucky wilderness. After Mr. Hardy’s escape, the two young sleuths are spurred into action when he mumbles the word “Felix” and they discover a dossier of a notorious ex-convict was stolen from his files. The trail leads them to New York City but ends abruptly in a cemetery! With the new clue of a spiral symbol the boys head to Kentucky as part of a highway construction crew to track down the kidnappers and saboteurs.

Hardy Boys 31: The Secret of Wildcat Swamp

Hardy Boys 31: The Secret of Wildcat Swamp
Author: Franklin W. Dixon
Publisher: Penguin
Total Pages: 193
Release: 1952-01-01
Genre: Juvenile Fiction
ISBN: 1101076453

An invitation from Cap Bailey, science teacher at Bayport High, to accompany him out West to Wildcat Swamp on an archaeological expedition triggers off a series of dangerous events for Frank and Joe Hardy. On their way West the boys and Cap have a near-fatal accident in a private plane which has been sabotaged. Though warned to leave the area, Frank, Joe, and Cap doggedly remain until they have caught the cunning ex-convicts they are up against in this swift-paced adventure.