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3. THE SECRET OF THE OLD MILL
FOREWORD
"Drop case or else danger for you and your family."
This warning addressed to Fenton Hardy not only alarms
the famous investigator and his detective sons, but also
puzzles them, because Mr. Hardy is working on more than
one case. Which one prompted the threat?
When more ominous warnings follow, Frank and Joe
suspect there is a link between the counterfeiting case
they are investigating and a secret case their father can-
not discuss since it involves national security.

The key to the solution of both cases appears to be
hidden in the old Turner mill, constructed in frontier
days but now a gatehouse for Elekton Controls Limited
engaged in manufacturing top-secret electronic parts for
space missiles. But the millhouse is occupied by two Elek-
ton employees who are hostile to Frank and Joe and re-
fuse to allow the young detectives to question the com-
pany's fourteen-year-old messenger boy who unknowingly
may be in possession of some vital 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 in a subterranean passageway.
How the young detectives extricate themselves from this
dangerous situation and unravel both mysteries will keep
the reader tense with suspense.
THE HARDY BOYS help their friend Chet Morton,
whose bright yellow jalopy was stolen from the Morton farm. Frank and Joe both wondered whether there was a connection between Chet's missing car and another that was stolen and wrecked not far from the Morton house.
It appears whoever stole Chet's car may be committing a series of robberies in the Bayport area, and that the suspect wears men's wigs.
The Tower Mansion has been robbed! The news spread through town that Hurd and Adelia Applegate's jewels and bonds were stolen from the safe at Tower Mansion. Frank and Joe's father, Fenton Hardy, a retired New York City Police detective, was asked to take the case. The Hardy boys are determined to help solve the case because the only suspect is the Applegate's caretaker, Mr. Robinson, their friend Slim's father!
The life-long thief, Red Jackley, mentioned the
old tower in his deathbed confession. Was he the Tower robber? Was the old tower at the Mansion? The Hardy boys set out to clear their friend's father, and earn the $1,000 reward at the same time.
THE HARDY BOYS help their father, Fenton Hardy, an internationally known detective, with tracking a ring of smugglers led by Felix Snattman. The boys decide to try out a new telescope from the old Pollit place, high on the top of the cliffs overlooking the water. Along with their friends, Chet Morton and Biff Hooper, the Hardys hear a call for help from inside the rundown house! Is the voice for real or is it a trap?
As the boys head for Bayport, they witness a boat chase. Suddenly a man in the trailing boat throws a grenade into the lead boat! The Hardy boys pull a man named "Jones" from the water and carry him to the nearby Kane farmhouse. When they return later with their father to question the man, the Hardys find the Kane's tied up and the accident victim gone!
The dangerous adventures continue for Frank and Joe throughout this mystery. The boys must investigate clues to their father's disappearance, the smugglers' activity, and the strange new inhabitants of the Pollit place. Are all the leads connected somehow? Can the Hardy boys handle the challenge?
Something is amiss in Bayport, the Hardy boys' home
town. First, there is trouble in Shantytown, then a strange
black craft tries to ram Joe and Frank's boat, the
Sleuth.
That night, the local bank is robbed. And later that same
night the young detectives' pals Chet Morton and Biff
Hooper, mysteriously disappear after a masquerade party.
Are the events related? And do they emanate from
Shantytown - or from Hermit Island, an isolated land
mass inhabited for many years by a strange recluse? Is it
significant that both the missing boys and the bank rob-
bers wore masquerade masks? Or is it more important
that Chet was wearing a costume identical to Frank's?
One by one, Frank and Joe tackle the clues, hardly
daring to think what might have happened to their miss-
ing friends. But it is not until the two brothers confront
the kidnappers that the overall pattern begins to emerge.
The kidnappers ruthlessly plan to force Frank and Joe's
famous detective father into choosing between justice
and his sons!
How the Hardy boys use all their courage and skill to
outwit the criminals provides an exciting climax to one
of the most baffling mysteries the young detectives have
ever encountered.
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.
In the old Montana mining camp of Lucky Lode, the
young detectives puzzle over a series of mysterious events.
A piano-playing ghost haunts the long-abandoned dance
hall. Eerie blue lights flash from the hilltop cemetery in
the dark of night. Strange men arrange a meeting at
Shadow of the Bear. A suspect disappears through a cur-tain of frozen ice.
How are these events related to the men who kid-
napped the boys in Chicago? Who booby-trapped the
helicopter which flew the young detectives to the ghost
town? And whatever happened to Bart Dawson who
seemingly deserted his gold-mining partners twenty-five
years ago?
Clue by clue, Frank and Joe cleverly fit into place the
scattered pieces of this dangerous puzzle and come up
with the astonishing solution.
OVERVIEW
OVERVIEW
FOREWORD
FOREWORD
1. THE TOWER TREASURE
2. THE HOUSE ON THE CLIFF
4. THE MISSING CHUMS
5. HUNTING FOR HIDDEN GOLD
Cover Picture - Original Edition
Cover Picture - Original Edition
Cover Picture - Original Edition
Cover Picture - Original Edition
Cover Picture - Original Edition
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