Hardy boys 7 book series

1)The House on the Cliff: Frank and Joe track down their missing detective father to a desolate cliffside mansion, exposing an international smuggling ring in coastal sea caves.

 2)The Secret of the Old Mill: Investigating a flood of counterfeit currency in Bayport leads the brothers to an abandoned watermill concealing a covert underground printing press.

 3)The Missing Chums: When Chet and Biff vanish during a boat outing, the Hardys' search draws them into a direct confrontation with bank robbers hiding on an isolated island.

 4) Hunting for Hidden Gold: The boys journey to the rugged Montana wilderness to recover stolen gold, navigating perilous abandoned mines and hostile outlaws.

 5) The Shore Road Mystery: Investigating untraceable automobile thefts along the coast, the brothers uncover a ring using disguised boats to transport and disguise stolen cars.

 6 )The Secret of the Caves: Searching for a missing radar scientist, the Hardys navigate the hazardous Honeycomb Caves against treacherous rising tides and a concealed gang.

 7) The Mystery of Cabin Island: A winter vacation at a frozen lake cabin turns dangerous when the brothers confront an armed prowler and recover a cache of stolen antique medals.