When the Hardys' wealthy neighbor is robbed, Joe and Frank are asked by their father to help solve the case.

The Hardy Boys are elated over their good luck when wealthy Elroy Jefferson invites them to spend Christmas vacation at his private retreat on Cabin Island. But when Frank and Joe make a reconnaissance trip in their iceboat, The Sea Gull to the island, a belligerent stranger orders them off. Why? Before twenty-four hours have passed, the Hardys find themselves involved in two mysteries: the first concerns the recent disappearance of Mr. Jefferson's

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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 principal members of a notorious gang responsible for a payroll robbery.

As Frank and Joe investigate the mysterious disappearance of a college professor, they stumble upon a baffling secret in a complex network of caves.

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment Company's cargo planes and Frank and Joe Hardy are called upon to assist their world-renowned detective father solve the baffling case. At Stanwide, the boys pose as employees and become suspicious of their boss's hostility towards them. Is he involved in the racket? And what is the truth behind the plane crash at sea in which Clint Hill,

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A not-so-sweet sixteen...
Rich girl Lindsay Peyton is throwing the biggest and best Sweet Sixteen bash that Bayport has ever seen. is throwing the biggest and best Sweet Sixteen bash that Bayport has ever seen. But when Frank and Joe discover that her car has been keyed, it looks like someone isn't so happy that Bayport's princess is showing off.
Meanwhile, a group calling themselves the Scaredevils is filming themselves committing...

Diving into deadly waters...
The world's largest reef exhibit is coming to the Bayport Aquarium. Frank and Joe are stoked for the unveiling of Predator Reef, a three-hundred-thousand-gallon tank that houses small sharks, rays, and thousands of colorful fish. It's also home to the aquarium's new mascot, Captain Hook — a rare and valuable, five-hundred-pound, giant sea turtle.
But instead of a big reveal, the boys get a big...

Lost in the woods... Bayport High's Green Environment Conservation Club is camping on Black Bear Mountain. Not only does the mountain live up to its name — the fierce, furry animals are everywhere — but rumor has it that a madman lurks in the nearby forest, and the crazy dude has a penchant for feasting on human flesh.
When the campers wake up, however, not only do they find a bear roaming the campsite, but their teacher is missing...

Lights! Camera! Sabotage?
It does not take much to convince Frank and Joe to be extras in the new zombie movie that's filming in Bayport. Not only do they get a behind-the-scenes glimpse of the magic that goes into making horror movies, they also get to wear freakishly realistic zombie makeup that makes them look like the walking dead!
But the horror gets a little too real when disaster hits the scene. Equipment fails left and right;a...

Disappearing act?
Everyone in Bayport can't wait for the biggest event of the season: the premiere of G-Force — the newest ride by the world-renowned Piperato Brothers. Their creation is going to change the fortunes of Funsport, Bayport's small and recently run-down amusement park. Frank and Joe are friends with Daisy Rodriguez, the owner's daughter, and are first in line for the ride's launch. Purple lights click off, a huge whoosh...