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

After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.

Frank and Joe get mixed up in mystery with the help of a short-wave radio.

Every night water strangely disappears from the new reservoir near Skull Mountain. Frank and Joe join forces with a team of skilled engineers to solve the baffling mystery.

College recruiters are pursuing Bayport High's football star, Terry Golden, and his clique of jocks enjoy basking in his aura of celebrity. When the hazing to become a member goes too far, the Hardy boys begin an investigation. Grades 4-7. (Hardy boys mystery stories ; 170).

Frank and Joe Hardy are determined to stop a group of pranksters before their mean-spirited practical jokes and vandalism become more destructive and dangerous.

Joe and Frank Hardy are attending the season's opening night at Funspot, a local amusement park that's been declining for years, but that recently got new owners and a facelift. Their friend Daisy's family has everything riding on Funspot's success: If the revamped park is a failure, her family will be broke! At first, an exhilarating new attraction is a huge hit but when one of the riders disappears into thin air, fun and games turns into spine-tingling...

Frank and Joe Hardy search a mysterious castle for clues to a stolen, extremely valuable comic book.