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

The Hardy brothers' search for the missing son of a wealthy industrialist leads them to Brazil and great danger.

The Hardy boys find the missing deed to an Indians' land, prevent a phony salesman from carrying through a reckless scheme, and help their father solve a top-secret case.

Brother detectives Frank and Joe return to dangerous Black Bear Mountain to help locate a scientist gone missing from a remote research station.

"Now with a brand-new look, this is an edition that collectors won't want to miss! In The Mystery of Cabin Island, the eighth book in the incredibly popular, long-running series, Frank and Joe Hardy encounter several dangerous setbacks as they search for Johnny Jefferson and some antique stolen medals. A special treat for Hardy Boys fans and any reader who's new to the series!"--

Frank and Joe Hardy assist their detective father in tracking down a notorious jewel thief.

When banker Raymond Dalrymple's life is threatened, Joe and Frank Hardy are called into the case in Fenton Hardy's absence.

Frank and Joe Hardy are trying to catch a crime gang in Bayport.

Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, an international spy ring, and a Scottish castle.

Joe and Frank try to find the daughter of an amusement-park owner who has gone missing without a trace.