After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.[...]
A counterfeiting case leads Frank and Joe Hardy into an investigation of an old mill, constructed by the pioneers[...]
Two of the Hardy Boys's chums take a motor trip down the coast. They disappear and are almost rescued by their friends when all are captured. A thrilling story of adventure.[...]
For action, mystery and cliff-hanging suspense, read The Hardy Boys Mystery Stories - featuring the thrilling adventures of America's favorite detective duo, Frank and Joe Hardy. Millions of young readers have teamed up with Hardy Boys, helping them in their quest to bring criminals to justice. Be[...]
When the Hardy boys reached the caves, they came unexpectedly upon a queer old hermit.
Joe, Frank, and their friends search the icebound Cabin Island for a missing boy and some stolen medals[...]
Frank and Joe Hardy's efforts to retrieve a top-secret invention from a scientist's house in Bayport leads them to a mystery involving a dangerous gang of jewel thieves and smugglers[...]
A clock in a vacant house provides a clue to the whereabouts of a gang of harbor thieves
In this book, originally published in 1934, the search for a stolen boat leads the Hardy Boys to Mexico where they become involved with a band of Indians and a strange smuggling operation.[...]
The Hardy boys investigate a dispute over a mysterious pond and rumors of piracy in Georgia
After the new hydrofoil they are guarding is stolen, the Hardy boys face frequent danger in solving a mystery involving criminals who operate by signs of the zodiac.[...]
While searching for the guard end of a broken saber that will solve one mystery, the Hardy brothers become involved with a gang of bank robbers.[...]
Suspecting that their friend has been swindled, the Hardy brothers investigate and find themselves on the trail of a much larger criminal operation.[...]