"In the past, victims seemed to have been children only. But since Frank was taken, who knows if anyone is safe? .... At this point, everyone is a suspect--maybe even Frank."--P. [4] of cover.

The Hardy Boys go undercover to find out about the dangerous secret society at the exclusive private school Willis Firth Academy in New England.

Their efforts to recover a stolen ancient chess piece lead the Hardy brothers to Hong Kong where they help smash an international criminal organization.

A chance meeting with a stranger on the road provides the Hardy boys with a clue to a gang of local burglars.

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.

Once again Frank and Joe Hardy accept the challenge of a puzzling case when their famous detective father asks the boys to assist him in tracking down a notorious jewel thief and his accomplices. The trail leads to the outskirts of the Hardys' home town and to a weirdly guarded mansion on the old Perth estate. With their friend Chet Morton, Frank and Joe tackle another mystery -- one which has baffled the town of Bayport for many years: What caused...