Frank and Joe travel to Philadelphia where they intend to prevent an attack on an extreme sports contest called the Big Air Games.

Frank and Joe try to determine the cause of recent injuries and deaths at a camp for troubled teens in the wilderness surrounding Moosehead Lake in Maine.

Frank and Joe travel to California where they investigate the leader of a utopian community and his followers to see if they intend to sabotage the oil industry.

Frank and Joe have eight hours in which to locate a bomb designed to blow up Billington Resort.

The Hardy brothers investigate injuries to students at the Rising Phoenix Martial Arts Center to see if they are connected and if someone at the school is to blame.

Frank and Joe go to the island of St. John to try to find the missing son of a UN ambassador.

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!

Investigate threats sent by an extremist environmental group -- STEMM -- to the owner of the local mall. These fanatics may resort to drastic measures to protect nearby wetlands. That is, if members of STEMM are really the ones behind the threats ... .

Frank and Joe Hardy must join the cast of a new reality show called Deprivation house, featuring a group of teens competing to see who can survive the longest without modern luxuries, and determine who's behind the death threats received by other contestants.

"It all starts with Joe Hardy dancing for his life :) - literally! And leads to both Frank and Joe getting enlisted to find Haley Danelle's missing online friends. But things soon turn deadly, and before they know it, the Undercover Brothers may soon be six-feet-under brothers! But that nothing to LOL about!"--Back cover.