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A "monster" who terrorizes Bayport and a girl who runs away to join a cult are the subjects of the Hardy boys' sleuthing.

A Japanese business tycoon mysteriously disappears and, soon after, a rare samurai sword is stolen from an art gallery.

Their search for an Easter Island idol takes the Hardy boys to Easter Island and on to investigate the theft of government material in Antarctica.

The Hardy boys accompany a Canadian teenager to Los Angeles to help locate a missing rare coin, but soon become involved in an even larger case.

Who is writing threatening notes? How could anyone get into the secret room of the old mansion? As Frank and Joe investigate, robbery and mistaken identity complicate matters.

The Hardy Boys investigate when a computer game designer and his company run into trouble.

"While attending an amusement park under the new ownership of their friend Daisy, Joe and Frank investigate the disappearance of a patron who was last seen riding a hit attraction, an event that has threatened Daisy's family's livelihood"--OCLC.

Frank and Joe Hardy become involved in a large and dangerous conspiracy while trying to keep the valuable invention created by one of their father's clients from falling into the hands of thieves.

The art collector who suspects the Hardy boys of stealing one of his valuable paintings offers them a chance to prove their innocence by hiring them to find the painting and the real culprits.

Frank and Joe thought they would have fun at their friend's birthday party, but when a video is stolen, the brothers have to solve the crime before the party is ruined.

Frank and Joe investigate the disappearance of the owner and designer of a new maze in Nova Scotia and encounter a ten-year-old mystery connected to it.

Frank and Joe Hardy try to help when their friends, the Wilkersons, a family that has been living in Bayport under the safety of the Witness Protection Program, are found by their predators and forced to flee again.

The Hardy Boys are framed for a jewelry store robbery.

The Hardy boys find themselves endangered by a disreputable investigative reporter.

College student Jake Martins is caught between a rock and a hard place when he's pressured to reveal Securitech information for a class grade, and he's accused of messing with security codes, causing a rise in criminal activity in the city.