Fenton Hardy, the famous private detective and father of the Hardy Boys, asks his sons to help him with his latest case involving the illegal drug trade. Hardy sends Frank and Joe to a house on the cliff, whose location offers an excellent vantage point to watch for smugglers. The Hardy Boys are tricked into going inside the house by cries for help and find themselves trapped for a short time in the attic, meanwhile, their telescope and motorcycles...

Frank and Joe travel to Massachusetts where they investigate a death and other mysterious events occurring at an amusement park.

Frank and Joe Hardy look for clues in this perplexing mystery.

During their father's investigation of a ruthless gang of terrorists, two young detectives face several adversaries.

Frank Hardy has been located. The victims in the past seemed to have been children only, but since Frank was taken, who knows if anyone is safe? Everyone is now a suspect, even Frank.

Brothers Frank and Joe Hardy investigate strange occurrences during Bayport Zoo's annual Halloween party, Boo at the Zoo.

While attending an amusement park under the new ownership of their friend Daisy, Joe and Frank investigate the disappearance of a patron who was last seen riding a hit attraction, an event that has threatened Daisy's family's livelihood.

One of Frank and Joe Hardy’s favorite places to hang out is the Bayport Junior Public Library. Having a library just for kids is the best, and they love the real-life bookworm mascots, a whole farm of them! But the town council is facing budget cuts and will vote soon on whether to shut down the BJPL and combine locations with the adult library. Just when the boys’ librarian is starting to sway the council in her favor, a valuable book goes missing...

Bayport High's Green Environment Conservation Club is camping on Black Bear Mountain, but the bears aren't the only danger--rumor has it that a madman with a taste for human flesh lurks in the nearby forest. When the campers awake one morning to find a bear roaming the campsite, they also find that their teacher is missing ... and blood is streaked across his tent. Frank and Joe go in search of him, but can they survive the dangers on the mountain?...

When the rodeo comes to Bayport, Joe and Frank catch the ranch hands trying to steal a prize horse. After the boys stop the theft, they're recruited to help drive the cattle back to the ranch. However, mysterious things continue to happen and the Hardy boys have to solve the mystery.