Nancy and the brothers team up to find Fenton Hardy, who disappeared while investigating a series of European art thefts.

Allison Troy's Transylvanian rock concert has locals fearing a reawakening of their most notorious denizen.

After a young woman denies the handbag he recovered is hers, Frank is left with a stolen Egyptian idol and a pile of trouble.

Nancy and famous criminologist Arlo Wetherly find mutilated photos of themselves.

Frank and Joe travel to an African game preserve to trap the mastermind of a huge poaching operation.

The Hardy boys spot peculiar, alien-like people on an old missile site being guarded by federal agents.

Frank and Joe are invited to join a charter flight which passes over the Bermuda Triangle.

While in Mexico trying to solve the mysterious kidnapping of their father, Frank and Joe discover hang gliding and dangerous enemies.

Nancy goes under cover to keep a light-fingered tennis star out of trouble.

A deaf woman witnesses a terrorist negotiating plans on the telephone.

Nancy is determined to restore the honor of a dear old gentleman who claims to be Santa Claus when he is accused of burglary.

Nancy is held for psychiatric observation when she tells the police an unbelievable story.

The lead singer of a rock band runs down investigative reporter Jerry Morgan.

Townspeople revile a psychically gifted girl (Melanie Griffith) who has a mysterious tie to an eerie mansion.

Joe awakens in a Hong Kong hospital and is led to believe that he has been comatose for a year and his father and brother are dead.

While in New Orleans for Mardi Gras, Frank and Joe's wallets are stolen; Nancy works under cover as a magician.

The brothers find a dead man in a coffin in their hotel room.

While aboard a ski train to Austria, a frightened girl fleeing unknown assailants switches flight bags with Nancy.

While windsurfing in Hawaii, Frank tries to rescue a girl named Maryann (Maren Jensen) who disappears and is claimed to be dead. He then begins to become obsessed with finding out what happened to her, but someone, who is also on her trail, is watching him.

A reclusive billionaire (Joseph Cotten) holds Nancy captive in his penthouse, and a girl (Cathy Rigby) sets fire to the building.

The boys go under cover at a New England college where three coeds have been kidnapped.