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Young detectives Frank and Joe Hardy, investigating the disappearance of a professor, encounter a hot-tempered hermit, and sabotage at the radar station and Honeycomb Caves.

When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, the Hardy Boys search for the truth.

Collects no. 1-4 of the graphic novel series "The Hardy Boys: Undercover Brothers, " in which Frank and Joe investigate the theft of an art treasure, a stolen identity case, a murder on the set of a television program, and a series of mysterious accidents.

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

When one of the Hardy Boys disappears while on a campout, the other is left behind to search, hoping he will see his brother alive again.

Frank and Joe investigate the disappearance of eight children from Misty Falls State Park in Idaho over the last twelve years after one of the missing children reappears with no memory of anything that happened previously.

Camping on Black Bear Mountain, Frank, Joe, and the conservation club wake up to find a bear roaming the campsite and their teacher missing.