Franklin W Dixon

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

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.

A chance meeting with a stranger on the road provides the Hardy brothers with a clue to a gang of local burglars.

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.

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...