Franklin W. Dixon

Timber wolves, a rocky Mountain blizzard, and a mine cave-in are only a few of the perils Frank and Joe Hardy encounter during their search for the notorious gang responsible for a payroll robbery.

When their peregrine falcon brings down a homing pigeon carrying rubies, the Hardy brothers find themselves involved with kidnappers.

When a new combat sports training facility opens in Bayport, Frank and Joe enjoy having somewhere to practice judo, fencing, archery, and biathlon, until a series of accidents leads them to investigate, suspecting sabotage.

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

Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, and international spy ring, and a Scottish castle.

An archaeological expedition in the West turns into a desperate attempt to capture robbers and an escaped convict.

Frank and Joe investigate the legend of Whalebone Island when they receive a warning concerning a sunken freighter.

There is a crisis in Bayport! Soon the city will be without water! Every night water strangely disappears from the new reservoir near Skull Mountain. Frank and Joe Hardy join forces with thteam of skilled engineers to solve the baffling mystery. When the boys arrive at the foot of the mountain, they are met by a human skull rolling down the slope -- a chilling warning from a weird hermit. Violence, too, stalks the mountain, where a gang controlled...

Two teenage sleuths help their detective father search for a famous rocket scientist whose disappearance endangers the launching of the Firebird Rocket.

Caught in their motorboat the Sleuth by a sudden storm at sea, Frank and Joe Hardy are helpless when the engine conks out. Drifting farther from shore amid the tumultuous waves, the boys are relieved to see the lights of a yacht. But their SOS is ignored. The shrill sound of a siren fills the night air. Moments later, a helicopter drops an object alongside the Sleuth. To the young detectives' astonishment it proves to be a wallet containing two thousand...