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.
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.
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 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.
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.
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