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

When the Hardy boys reached the caves, they came unexpectedly upon a queer old hermit.

Joe and Frank investigate some pranks around Bayport, leading them to the Red Arrow, a crime grang.

Frank and Joe are brothers, but that won't stop them from competing against each other at the Fun World arcade's video game tournament. The boys make a bet: Whoever wins the competition gets to move into the cool new room their dad just built! But suddenly money goes missing. The owner of Fun World shuts down the tournament until the stolen cash is returned! Can the boys figure out who took it? Or will their chances of victory -- and a brand-new room!...

Frank and Joe try to stop the illegal international CD-burning operation that employs teenagers.

Frank and Joe must stay undercover on the Deprivation house reality show to discover who's behind the continuing "accidents."

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.

Frank and Joe Hardy struggle to locate two stolen paintings that contain clues to hidden treasure. A long-distance telephone call from Chet Morton's uncle summons Frank and Joe Hardy and their staunch pal Chet to a summer art school, located near old Fort Senandaga, which is reputed to be inhabited by a ghost. The young detectives' assignment: recover two famous oil paintings stolen from the valuable Prisoner-Painter collection owned by Jefferson...

What is the mysterious organization known as ATAC (American Teenagers Against Crime)? And how are detective brothers Frank, Joe, and Fenton Hardy involved? Uncover the clues to these questions as the Hardy brothers take to the skies to crack a diamond-smuggling team of sky-divers and then encounter a young woman whose identity has been stolen (or at least that's what a young woman claiming to be Joy Gallagher claims).

The Hardy Boys look into shady occurrences at the Willis Firth Academy, a private boarding school in New England, where the fraternity brothers of Gamma Theta Theta struggle with dangerous problems and rivalries.