Henry Carter Hull

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

Frank and Joe uncover a plot to steal a vital top-secret instrument of the space program.

Frank and Joe Hardy plan to compete in the local arcade tournament, agreeing the winner will get to move into the cool new room built by their dad, and when money goes missing from the competition, they work together to solve the mystery.

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.

Brothers Frank and Joe Hardy and their elementary school friends help them track down what they hope is a treasure after they find a mysterious map.

Frank and Joe are harassed when they try to locate a descendant of the Aztecs.

When a ship supposedly carrying a gold Pharaoh's head sinks, Joe and Frank help their father discover whether the owner is trying to defraud the insurance company and along the way encounter a ghostly apparition and a scuba diver with a grudge.

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

Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures.

The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor.