When the Hardy boys eagerly agree to assist their friend Jack Dodd and his father in locating a family treasure, the two young detectives are unaware of the baffling complications that will arise. The only clue to the long-lost treasure is a cryptic message written by a Pilgrim ancestor. But when Mr. Dodd and Jack are accused of stealing cars and then mysteriously disappear, Frank and Joe are confronted with a triple mystery. Have their friends run...

The Hardy brothers solve the mystery of the missing inventor and recover some valuable missing jade.

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

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...

In two separate cases Joe and Frank Hardy search for stolen jewels to prove a man's innocence and attempt to catch a gang of drug smugglers.

Joe's part time job at a radio station involves the Hardys in one of their most dangerous cases ever.

Joe Hardy is kidnapped by a gang of jewel smugglers as a warning for the Hardy Boys' father to stay away from their operation.

A classic motorcycle is being put back on the market, but a competitor is trying to sabotage the plans. The Hardy Boys work hard to find out who is behind the scheme, before someone gets hurt.

When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.

"Working undercover for an Atlanta airline, the Hardys have uncovered an international terrorist ring - the Assassins - Bent on high-stakes smuggling and cold-blooded murder. But who is in control? What is their ultimate aim? Who will be the next to die? The dangerous truth lies in the rough and rugged wilderness of faraway Alaska ..."--Cover.