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Frank and Joe's investigation into the disappearance of their friend Phil Cohen, an electronics whiz, leads them to a top-secret plot that threatens the security of the entire world.

The Hardy Boys stumble across a twisted technological plot creating perfect replicas of human beings and fight for the survival of a top secret government intelligence organization.

After Joe Hardy's girlfriend Iola is killed by a car bomb, the Hardy brothers tangle with an international terrorist killer and a secret government agency called the Network.

After the kidnapping of the Hardy boys' father, criminals hold New York City ransom under the threat of a city-wide fatal virus infection.

Sent on a secret mission to warn a federal witness who is being hunted by a hit man, Joe is ambushed along the way and loses his memory.

The Hardy Boys find themselves on their own in France, fighting the largest organized crime ring in the world.

In trying to free their friend Holly from the clutches of a murderous mountain cult, the Hardy Boys find that the lunatic Rajah and his followers have spread to their own home town.

Frank and Joe investigate a series of death threats against America's king of horror writers, Mark Stevens.

On the trail of a multimillion-dollar smuggling operation, the Hardys are shocked by the slaughter they find.

Frank and Joe travel to Nepal to try their luck climbing the Himalayas, but danger awaits them even in the frozen heights, and the boys must struggle to keep from becoming the next victims in a series of suspicious accidents.

Frank Hardy's girlfriend Callie mistakenly recovers a top-secret codebook and involves them in a network of fraud, corruption, and murder.

When Bayport is hit by a rash of vicious pranks, Frank and Joe investigate.

The Hardys have gone undercover, determined to crack a truck hijacking scheme, but a gang of thugs are just as determined to run them off the road.

Joe and Frank battle arsonists in the wilderness of Alaska's Denali National Park.