What is the mysterious organization known as ATAC (American Teenagers Against Crime)? And how are detective brothers Frank and Joe Hardy involved? Uncover the clues to these questions as the Hardy brothers take to the skies to crack a diamond-smuggling team of sky-divers and then encounter a young woman whose identity has been stolen or at least that's what a young woman claiming to be Joy Gallagher claims.

Has an alien plague turned the teenagers of Bayport into mindless, shambling undead creatures? Or is it something far more innocent--but perhaps equally deadly? The Hardy Boys are on the case!

In this change of pace adventure, Frank and Joe Hardy discover a rogue mentor agent within A.T.A.C. (American Teens Against Crime) -- when that agent tries to kill them! But it's soon discovered he was being manipulated by malevolent forces who kidnapped his child -- and now the Hardy Boys have only until dawn to find the man's son!

"The evil female counterparts of the Hardy Boys, the Sisters Noir, and their equally evil father return to create serious chaos! Joe and Frank are working out at a top-secret training facility on the grounds of A.T.A.C. headquarters when the compound is set-upon by Poppa Noir's anti-justice organization. The only two people who are available to free the captured adult ATAC agents are the Hardy Boys, and they have their hands filled battling their...

Frank and Joe Hardy search for the Great Marconi's kidnapped assistant and stumble into a world where nothing really is as it seems.

"Frank and Joe go undercover at a national spelling bee where a mysterious madman known as the Hangman is determined to erase the competition! Teens from across the globe have been invited to attend, and A.T.A.C. and the Hardy Boys have to do everything they can to keep the Hangman from spelling disaster!" -- fromn publisher's web site.

Frank and Joe are accused of crimes they never committed that involve almost every one of their past missions. On the run, the Hardy Boys encounter old friends and foes but must find out who has framed them before it's too late and A.T.A.C. catches them!

Four exciting adventures take Frank and Joe Hardy across the globe to solve dangerous mysteries! The fate of the world lies in the library? It does when the two sleuthing siblings need to provide security for the children of visiting delegates! What lengths will someone go to make the most explosive radio show of all? Tune in! What happens when the Hardy Boys are split up? Danger looms! And, what is Amelia Earhart doing flying around? The Hardy Boys...