The robbery of the treasure in the tower proves to be an exciting challenge to Frank and Joe. Frank and Joe attempt to foil a ruthless espionage ring in their effort to sabotage the United States space program.

In the third volume of the classic children’s mystery series, the Hardy Boys’ criminal investigation at an old mill puts the teens in danger.
 
Someone is passing counterfeit bills around their hometown, and Frank and Joe Hardy are convinced it has something to do with the mysterious happenings at the Old Mill. But as soon as they start investigating, someone tampers with their speedboat, and the brothers are nearly...

Frank and Joe Hardy receive an unusual assignment from their detective father. They are to "break into" the house of a Bayport neighbor, Malcolm Wright and retrieve a top-secret invention that the scientist had hidden in his study before leaving for California. The invention is in danger of being stolen and the boys race against time to beat the thieves at their own game. The young detectives soon discover that they are involved in a mystery far

...

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.

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,

...

"Joe," I said, concerned, "hit the brake!"
"I am," Joe said, pumping the pedal now. But the car didn't slow at all. The traffic light turned red as we hurtled toward the intersection. And suddenly I saw the one other car out this early on a Saturday morning — a huge Express Delivery truck!
Joe screamed. I leaned forward, bracing myself against the dashboard. There was nothing we could do. It was speeding right at us!

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...

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...

As I rounded the corner, I spotted Rick just ahead. He paused and bent down to poke at something on the ground by his feet, muttering something that I couldn't make out due to the wind.
WHOOSH!
I gasped and jumped back as a huge pile of snow slid off the roof of the ski shack, completely burying Rick!

Mr. Lakin made his way over to Don Sterling. "It's bad enough we have to suffer through your performances onstage. Now come on, we're going to be late for our own party. The whole world doesn't stop for you, you know."
Mr. Lakin gave the Don's boot a kick. The Don didn't move. Joe and I exchanged a glance. Something was definitely not right. Joe knelt down and put his fingers on Don Sterling's neck like we'd been taught in our first aid course....