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

On a winter vacation in Jamaica the Hardy boys begin a dangerous adventure when an ancient bronze death mask is discovered near their beach house.

With only the slender clue of an arrow-shaped tie clasp, Frank and Joe Hardy pick up the trail of the cunning gang of thieves responsible for a wave of jewelry-store holdups. But their investigations are interrupted when a desperate plea for help comes from their widowed cousin who lives on a cattle ranch in New Mexico. Frank, Joe, and their pal Chet Morton fly there immediately. The mysterious disappearance of one cowboy after another has given Crowhead...

The Hardy boys pursuit of a hijacked collection of stuffed animals and their father's investigation into an industrial spy ring eventually lead to the wilds of Northern Canada.

Their efforts to recover a stolen ancient chess piece lead the Hardy Brothers to Hong Kong where they help smash an international criminal organization.

Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, an international spy ring, and a Scottish castle.

While investigating the theft of a valuable idol, Frank and Joe enounter a terrified business woman, a walking mummy, and a weird glass eye.

The Hardy brothers embark on a freighter trip under mysterious circumstances and find themselves involved with a smuggling ring.

Frank and Joe Hardy encounter the Footprints, an espionage ring which is attempting to steal a top-secret instrument paramount to a successful U.S. space program.

Difficult assignments are nothing new to the Hardy boys, and this one that takes them to the deep South is particularly challenging. Their mission: to vindicate a long-dead Confederate general, disgraced during the Civil War because he was accused of stealing hidden gold belonging to a bank. In a museum exhibiting relics of the Civil War, the brother sleuths find a puzzling clue that may help to clear the general's name and pinpoint the location of...