On a trip to a retired police captain's country home, the boys and their friends find him missing and themselves plagued with mysteriously threatening happenings that seem related to an old local legend.
While in the air, Nancy sees a car go off the road, and reports it. Everyone says the road is not been used since the bridge went down. Searching for that special car leads her to a young mechanic, but as they open the barn-doors?
Nancy's aunts are going to sell their property. The day before the deal is reality, a burglar steals all documents. Nancy goes to her aunts to explain. One aunt shows very discomfort, and speaks about voices in the walls??
Nancy revives a play in a theater that is supposed to be haunted. Actors from the original cast return to do the play. They seem to have intentions rather than the play, which makes Nancy suspicious and determined to discover the secret of the phantom.
Frank thinks he sees a girl whom he knew years ago who went missing, whose parents hired his father to locate but couldn't. When he tries to talk to her she claims that she is someone else. So he and Joe try to follow her but someone tries to kill them so they think she's mixed up in something.
Under a Charity Fair, the landowner claim it has been a jewelery theft from their safe. A young Mexican is accused, after been seen on the property. Nancy believes the case has more sides to it than it seems. Who and how?
At a party after a winning football game, the star feel discomfort. After party is over, Georgie forget her purse and goes back for it. Through the window she see a body on the floor. Nancy and police come along and see nothing. Foul play??
When Fenton disappears while in Europe, Joe and Frank go there to find him. Eventually they meet a Romanian police inspector who's working with their father. They also run into Nancy Drew; it seems that Fenton was working for her father and she came to find out what he learned. Eventually they find themselves in the village where Dracula is from.
The boys and their father go to Africa to help find out who's behind some poaching. The prime suspect is a hunter who runs a Safari where most of the poaching is going on. But Frank falls for the man's daughter and doesn't believe he has it in him to do what they suspect him of. But when evidence against him is discovered he just gives up.
Joe and Frank are in Bermuda. Before they leave, a man who works for a someone who smuggles diamonds, needing money to pay back some people he owes, steals the diamonds and replaces them with fakes. His boss then gives them to his courier, a flight attendant on the plane Joe and Frank are on. So he goes to the airport and before it leaves, drugs the pilots, so while in flight, they pass out. So Frank and Joe try to fly but instead crash on an island and some of the passengers think they're in the Bermuda Triangle.
Fenton is in Mexico being chased by someone. He then calls the boys and tells them to bring something. And that someone will meet them but before he could tell them anything else, the one following him finds him. When the boys arrive and check into the hotel, two girls who are in trouble walk up to the boys and utters the words their father told them their contact would say. Later a man who claims to be a friend of their father approaches them but they don't know him.
Nancy sees someone stealing a watch. The thief turns out to be a rich girl and a kleptomaniac. She is a competitor in Las Vegas' tennis tournament. Lots of jewellery around the casinos starts disappearing.
A deaf girl who's in Las Vegas with a friend, stops at a gas station. She sees a man in a phone booth talking and reads his lips. She then drives off, she tells her friend that the man was talking about bombs being planted at a hotel. So they go to the hotel and try to tell the manager who doesn't believe them. They run into Joe and Frank who tries to help them. Later the man runs into her and tells his accomplice about her so they try to deal with her.
A burglar dressed as Santa. A drifter in a stable next door, gets accused for burgling. Nancy don't believe that this gentle man is guilty, so she starts looking for clues. A mysterious car around. Who and what is going on?