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

Gen flaunts his ingenuity as a thief and relishes the adventure which takes him to a remote temple of the gods where he will attempt to steal a precious stone.

Two brothers, having run away from the aunt who plans to adopt only the younger one, are sought by a detective hired by their aunt, but they find protection from a gang of Venetian street children and their leader, the Thief Lord.

Ruth Rose, Josh, and Dink attend a concert during which someone steals the star's diamond pendant, and they are soon on the trail of the thief.

While visiting their friend Wallis and her adopted daughter on Mount Desert Island, Maine, Josh, Dink, and Ruth Rose investigate why three white wolf cubs were stolen, and by whom. W is for Wolf. ... Dink, Josh, and Ruth Rose are thrilled to visit Wallis Wallace at her new cabin in the Maine wilderness. On their very first day, they glimpse a white wolf and her babies on a cliff. But soon after the kids spy the wolf family, the pups are wolf-napped!...

Dink, Josh, and Ruth Rose investigate the theft of a great deal of money from the belly of a nearly life-size Tyrannosaurus Rex model that their friend, Jud Wheat, is using to raise money for a dinosaur museum.

When Dink, Josh, and Ruth Rose visit a dude ranch in Montana, they find themselves with another mystery to solve, this one involving the theft of money from the ranch's safe and of a large gold nugget that Josh had found.

When Frank and Joe investigate threatening notes and a secret room in an old mansion, robbery and mistaken identity complicate matters.

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

"When a casino robbery in Atlantic City goes horribly awry, the man who orchestrated it is obliged to call in a favor from someone who's occasionally called Jack. While it's doubtful that anyone knows his actual name or anything at all about his true identity, or even if he's still alive, he’s in his mid-thirties and lives completely off the grid, a criminal's criminal who does entirely as he pleases and is almost impossible to get in touch with....