Light Hardcover (1 lb or less)

Colorado

In one of the most dangerous and intriguing cases of their careers, Frank and Joe Hardy help their father investigate a series of mysterious car accidents. Each of the drivers had seen a signpost marked DANGER shortly before his accident. The young detectives investigate, only to discover that the signposts have vanished. The attempted theft of a secret experimental motor and the kidnapping of a famous race horse are part of this thrilling case, which proves to be as sinister as the signposts themselves.

Hardy Boys 15: the Sinister Signpost

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Hardcover (1 to 2 lbs)

Tennessee

The Hardy Boys

The house on the cliff has been vacant and is supposed to be haunted. Then it is reported to be the abode of criminals. Mr. Hardy starts to investigate and disappears, so the boys set to work to see what they can do.

House on the Cliff #2

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#hardcover #adventure #fiction #hardyboys 

Illinois

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 36: the Secret of Pirates' Hill

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#hardcover #fiction #hardyboys #mystery #number12 previous library book

Virginia

Footprints lead to the breakup of a ring smuggling Chinese aliens. Published originally in 1933.

Hardy Boys 12: Footprints under the Window

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1964 edition. Inscription on inside front page. Ink mark on inside front cover. See photos.

Joe and Frank help capture a band of car thieves who have framed and kidnapped their friends

Hardy Boys 06: the Shore Road Mystery

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Florida

Frank and Joe Hardy meet many adventures while trying to recover a valuable stolen artifact in the Northwest Territories

Hardy Boys 42: the Viking Symbol Mystery

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#hardyboys #thetowertreasure #fiction #juvenilefiction #ya #youngadult #hardcover #detective #frankandjoehardy #hardyboysmysteryseries 

The Hardy Boys #1

More information to be announced soon on this forthcoming title from Penguin USA

The Tower Treasure

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#hardcover #hardyboys #themeltedcoins #juvenilefiction

West Virginia

The Hardy Books copywrite 1970

The Melted Coins #23

#hardcover #vintage #mystery #classic #hardyboys #livingbook #boys #childrens #kids #juvenilefiction 

Oregon

Hardy Boys 03: the Secret of the Old Mill

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#hardcover #juvenilefiction #fiction #mystery #classic #hardyboys #detective #frankandjoehardy 

Washington

Frank and Joe Hardy are investigating a mysterious old house high on the cliffs above Barmet Bay when they are frightened off by a scream. The boys return to the apparently haunted house when they make a connection between the place and a smuggling case their father is working on. When their father goes missing, they have to investigate the caves beneath the house and confront the smugglers.

Hardy Boys 02: the House on the Cliff

Frank and Joe investigate the legend of Whalebone Island when they receive a warning concerning a sunken freighter

Hardy Boys 17: the Secret Warning

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#hardcover #fiction #hardyboys #boysmystery #boysmystery #detectivr #hardboys #mystery #mysteryseries 

#hardcover #Hardyboys The 3 stories are: The Caribbean Cruise Caper, Daredevils, and Skin & Bones.

Kentucky

3 Great Mysteries in 1 book

The Hardy Boys collector’s edition

#fiction #juvenilefiction #ya #youngadult #hardcover #hardyboys #hardyboysmysteryseries #franklinwdixon #thehouseonthecliff 

The Hardy Boys #2

The House On The Cliff

#hardyboys #theshoreroadmystery #fiction #hardcover #youngadultfiction #ya #youngadult 

The Hardy Boys #6

The Shore Road Mystery

Pennsylvania

With two cases in tow, the Hardy boys look to Turner mill for clues. Determined to learn the secret of the old mill, Frank and Joe employ a clever ruse to gain entrance, only to find themselves trapped. How the young detectives extricate themselves from this dangerous situation and unravel mysteries will keep readers tense with suspense!

A Western Publishing Book from 1967. #hardcover #hardyboys #mystery #homeschool 

Wisconsin

A Power Boys Adventure 

The Mystery of the Vanishing Lady

#paperback #detective #fiction #hardyboys #hardyboysmysteryseries #juvenilefiction 

Light Paperback (1 lb or less)

New York

Hardy Boys

ATAC BRIEFING FOR AGENTS FRANK AND JOE HARDY

MISSION:
Determine the cause of recent injuries and deaths at a camp for troubled teens.

LOCATION:
The wilderness surrounding Moosehead Lake in Maine.

POTENTIAL VICTIMS:
More boys in the program. Counselors.

SUSPECTS:
We have reason to suspect that the founder of the camp, Linc Saunders, is behind this.

Operation: Survival

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Iowa

#hardcover #fiction #hardyboys #34 #detective #frankandjoehardy #hardyboysbookone #hardyboysmysteryseries 

Idaho

A dying criminal confesses that his loot has been stored "in the tower." Both towers of the looted mansion are searched in vain. It remains for the Hardy boys to make an astonishing discovery that clears up the mystery and clears the name of a friend's father.

Hardy Boys 01: the Tower Treasure

#hardcover #fiction #childrens #mystery #detective #series #firstedition #vintage #hardyboys

First edition 1962

When dogs and men suddenly disappear, and strange screams fill the night, fantastic stories of vengeful ghosts are almost believable. It is these strange happenings which bring Frank and Joe Hardy to the Pocono Mountains to help their father's friend solve the mystery of Black Hollow. But when the Hardy boys and Chet Morton arrive at Captain Thomas Maguire's cabin on the edge of the hollow, he has disappeared. Frank and Joe are determined to find the captain, despite Chet's misgivings after a night of weird and terrifying screams. Strangely, it is a small puppy that discloses a most unusual and surprising set of circumstances, involving a mute boy, an elusive hermit, and a fearless puma trainer.

Hardy Boys 41: the Clue of the Screeching Owl

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A cryptic message from their famous detective father and a note concealed in a ventriloquist's dummy lead Frank and Joe Hardy on a dangerous search to the tropical islands in the Caribbean. There the teenage detectives are constantly beset by vicious henchmen of a criminal mastermind. Danger stalks the boys' every move, once in an isolated sugar mill, another time in a shark-infested sea. But when Frank and Joe come face to face with the ghost at Skeleton Rock, it will be as much of a surprise to the reader as it was to the young detectives themselves.

Hardy Boys 37: the Ghost at Skeleton Rock

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South Carolina

Together in this one book are two of the Hardy Boys' oldest mysteries that began the classic mystery series of the sleuthing siblings.

In The Tower Treasure, the Hardy boys' summer is ruined by a red-haired robber striking all over town. No robbery is more devastating than of Tower Mansion, home to one of the wealthiest families around. To prove the mansion's caretaker is innocent, the Hardy boys will have to solve the mystery of the stolen jewels before time runs out.

In The House on the Cliff, Frank and Joe are asked to help out their famous private detective father on his latest drug smuggling case, which sends them to an old house on a cliff to serve as lookouts. But when cries for help lure the boys inside the house, they realize they could be in more danger than they thought.

Franklin W. Dixon

Hardy Boys 15: the Sinister Signpost

Franklin W. Dixon

House on the Cliff #2

Franklin W. Dixon

Hardy Boys 36: the Secret of Pirates' Hill

Franklin W. Dixon

Hardy Boys 12: Footprints under the Window

Franklin W. Dixon

Hardy Boys 06: the Shore Road Mystery

Franklin W. Dixon

Hardy Boys 42: the Viking Symbol Mystery

Franklin W. Dixon

The Tower Treasure

Franklin W. Dixon

The Melted Coins #23

Franklin W. Dixon

Hardy Boys 03: the Secret of the Old Mill

Franklin W. Dixon

Hardy Boys 02: the House on the Cliff

Franklin W. Dixon

Hardy Boys 17: the Secret Warning

Franklin W. Dixon

Hardy Boys 12: Footprints under the Window

Franklin W. Dixon

The Hardy Boys collector’s edition

Franklin W. Dixon

The House On The Cliff

Franklin W. Dixon

The Shore Road Mystery

Franklin W. Dixon

Hardy Boys 03: the Secret of the Old Mill

Mel Lyle

The Mystery of the Vanishing Lady

Franklin Dixon

Operation: Survival

Franklin W. Dixon

Hardy Boys 02: the House on the Cliff

Franklin W. Dixon

Hardy Boys 01: the Tower Treasure

Franklin W. Dixon

Hardy Boys 41: the Clue of the Screeching Owl

Franklin W. Dixon

Hardy Boys 37: the Ghost at Skeleton Rock

Franklin W. Dixon

Hardy Boys Mystery Stories

Franklin W. Dixon

Hardy Boys 41: the Clue of the Screeching Owl