The Hardy Boys and Nancy Drew meet a group of musicians (led by songwriter Bernie Taupin in his acting debut) and Joe talks them into playing a gig at the Dracula's Castle festival, with Joe as one of the singers, so they can get in to search for their father.
While the Hardy Boys are in Hawaii for a surfing contest, their hotel room is robbed. Discovering that they're not the only victims, the two detectives volunteer to help the Hawaiian police apprehend the burglars.
After the pilots are mysteriously knocked out, Frank and Joe Hardy crash land a commercial airplane full of gorgeous stewardesses on a deserted island in the Bermuda Triangle after a major tropical storm.
The Hardy Boys investigate a crooked disc jockey and a case of record piracy. Joe Hardy makes his singing debut at a disco where Frank recognizes a girl who has been missing for three years but denies her identity when confronted.
Frank and Joe go to Transylvania to find their father, who disappeared while investigating a series of European art thefts. They encounter Nancy Drew at a festival called Dracula's Castle, and end up joining forces.
Nancy Drew and her friends see a beam of light coming from a supposedly abandoned lighthouse, and a professor tries to convince her that it is haunted. The local sheriff thinks they're imagining things, so it's up to Nancy to solve the mystery.
While windsurfing in Hawaii, Frank Hardy tries to rescue a girl who disappears and is claimed to be dead. He then becomes obsessed with finding out what happened to her, but someone else is watching him, who is also on her trail.
When Nancy Drew and her friends revive a 20-year-old play to raise money for a youth center, they are astounded when five members of the original cast return to perform in it, especially when the theatre is supposed to be haunted.
On the 4th of July, the Hardy Boys stop in a small town to help their friend Harriett with a concert, but they become suspicious when she acts strangely and then gets arrested for a hit-and-run accident.
Nancy goes undercover at an exclusive tennis tournament to keep a kleptomaniac classmate out of trouble during a crucial match, although Nancy and her girlfriend Bess don't mind the handsome tennis pro.
The Hardy Boys, while doing some legwork on a case of their father's involving a missing Russian scientist, see a UFO that leads them to a mysterious mansion full of illusions, where floors disappear and rooms change size.
Joe and Frank Hardy, suspicious of their father's "fishing trip," follow him and become involved in the search for an amnesiac ex-soldier being chased by killers for some secret he knows. They end up at a club called the Haunted House that has mazes, trapdoors, and secret passageways.
When Joe Hardy's fiancee is killed by a hit-and-run driver, the FBI won't let the police arrest the man until some case of theirs is finished, so Joe takes the law into his own hands and goes undercover as a surfer.
Frank and Joe Hardy try to visit Captain Maguire, the uncle of their father's assistant Callie, but discover that he disappeared in a mysterious wooded place called Witches' Hollow. Their only clues are a mute's sketches.
Joe Hardy is still haunted by memories of his dead fiancee, but has to focus his mind on the case when Jocco's girlfriend overhears him talking to the police on the phone. Meanwhile, Frank Hardy tries to help Joe by going undercover too, but Jocco finds out and traps Frank in a shark-infested area.moreless
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