Teenage detectives Frank and Joe Hardy investigate a case of counterfeiting.

When Frank and Joe Hardy put a stop to the alarming, but mostly harmless, pranks of amateur moviemaker Seth Diller, a series of more dangerous copycat pranks leads them to a criminal group called the Red Arrow.

"A reenactment leads to the death of Bayport's biggest benefactor, and the Hardy Boys get involved, especially when a favorite teacher turns out to be a prime suspect."--

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.

A chance meeting with a stranger on the road provides the Hardy brothers with a clue to a gang of local burglars.

Frank and Joe unravel two mysteries, one involving a counterfeiting case and the other concerned with a national security case their father is working on.

Frank and Joe solve a mystery involving the disappearance of a professor, a hot-tempered hermit, sabotage at the new Bayport Coastal Radar Station, and the Honeycomb Caves.

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment Company's cargo planes, and Frank and Joe Hardy are called upon to assist their world-renowned detective father to solve the baffling case. At Stanwide the boys pose as employees, and become suspicious of their boss's hostility toward them. Is he involved in the racket? And what is the truth behind the plane crash at sea in which Clint Hill,...

Frank and Joe investigate sabotage on the set of a pirate-themed reality television show.

When signs of vandalism begin to appear at the Morton family farm, Chet and Iola Morton are worried that their grandparents are in danger, and with their parents away, they ask Frank and Joe Hardy for help.