After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.

Determined to uncover the secret of the old mill, the Hardy boys unravel two mysteries, one a counterfeiting case and the other a national security case their detective father is investigating.

Joe and Frank Hardy are helping their friend Jack to locate a family treasure when Jack and his father are accused of stealing cars and then mysteriously disappear.

A series of adventures begins for the Hardy boys after they sail their ice-boat to the desolate and inhospitable Cabin Island.

The Hardy brothers are falsely accused of a robbery at an airport and decide to turn the tables on the real thieves.

Triggered by the disappearance of a brilliant young professor, this mystery takes the Hardy boys first to Kenworthy College, where they find a puzzling message on an examination paper. But then their pal Chet Morton, with his new metal detector, and buddy Biff Hooper, turn up a clue that sends the young detectives on an exciting search in another direction -- to the Honeycomb Caves, on the seacoast. A hot-tempered hermit who considers the caves his...

When a two-hundred-pound sea turtle goes missing from the Bayport Aquarium, Frank and Joe Hardy investigate, discovering a network of underground tunnels hidden beneath Bayport that is aiding a sinister smuggling ring.

Frank and Joe must take the shine off a jewel thief who sends ominous riddles in this Hardy Boys adventure. First a priceless painting disappears from the museum; then two ancient samurai swords vanish from a private collection. A string of robberies has hit Bayport, and all signs point to the Phantom, a recently released ex-con who last struck more than twenty years ago. There's only one problem: the Phantom has vanished into thin air, and not even...

"The Hardy Boys are visiting Paris! Joe is excited to check out all the street art he's heard about. And Frank can't wait to go to all the museums he's researched. On their very first day in the city, the brothers are woken up early in the morning by fireworks. But these are no ordinary fireworks. They are a part of elaborate cover for the heist of a priceless artifact. What's worse, the theft seems to have been orchestrated by Joe's favorite street...

Frank and Joe Hardy are caught up in a dangerous web of intrigue when they agree to help their friend search for his grandfather's missing will, which they hope will tell them who or what the mysterious Yellow Feather might be.