Nancy Drew and Frank and Joe Hardy find another mystery while vacationing in Italy, where they help an American girl with no memory discover the truth about how she got to Rome and why someone wants to hurt her.
Frank and Joe Hardy try to help when their friends, the Wilkersons, a family that has been living in Bayport under the safety of the Witness Protection Program, are found by their predators and forced to flee again.
On vacation in London, Frank and Joe search for the thief of the Molar Mike, a voice transmitter designed to be implanted in a tooth, but as they close in on a spy recently seen in the city, the suspect list grows.
Frank and Joe investigate the disappearance of the owner and designer of a new maze in Nova Scotia and encounter a ten-year-old mystery connected to it.
Frank and Joe Hardy race to solve find the culprit behind a series of burglaries and suspicious accidents plaguing a motorcycle exhibition and competition.
Frank and Joe thought they would have fun at their friend's birthday party, but when a video is stolen, the brothers have to solve the crime before the party is ruined.
The art collector who suspects the Hardy boys of stealing one of his valuable paintings offers them a chance to find the painting and the real culprits.
