Frank and Joe solve a dangerous mystery involving a payroll robbery, a mine cave-in, a piano-playing ghost and a booby-trapped helicopter.

Frank and Joe unravel two mysteries, one involving a counterfeiting case and the other concerned with a national security case their father is working on.

When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, Joe and Frank search for the truth.

When the daughter of an amusement-park owner goes missing, it's anything but fun and games in this Hardy Boys adventure-a new take on the classic series. Daisy Rodriguez is missing. Just like that, gone without a trace. Her father, Hector Rodriguez-owner of Funspot, Bayport's local amusement park-is frantic. He feels he's to blame, since Funspot was recently the location of another disappearance. Could Daisy's vanishing be somehow connected? Joe...

During their father's investigation of a ruthless gang of terrorists, the two young detectives face several adversaries.

Frank and Joe investigate a walled estate guarded by savage dogs, where a businessman is hiding in fear of his life.

Frank and Joe face danger on a tropical island in the Caribbean where they were led by a note hidden in a ventriloquist's dummy.

The Hardy boys embark on another puzzling mystery when they try to discover who is stealing rare collections of ancient pirate treasure and smuggling them out of the United States.

A series of adventures begin for the Hardy boys after they sail their-ice boat to the desolate and inhospitable Cabin Island.

The search for missing gold takes the Hardy boys to the Yucatán Peninsula where they uncover a second mystery.