Tom Swift flies his airship to the mountain tops of Colorado to seek for the secret of the Diamond Makers: criminal scientists who have figured out the formula of manufacturing a limitless fortune in diamonds. But these rogues will stop at nothing to keep their secret. Tom & friends are soon captured and left to die in a collapsing mountain.

Tom Swift & friends decide to trial an experimental airship near the New Jersey coast, and are unexpectedly swept out to sea by hurricane winds. Unable to steer or navigate without tearing the airship apart, the hapless crew must simply let the storm take them wherever it will. Unfortunately, the storm proves too much for the craft and Tom makes a crash landing on the uninhabited and crumbling Earthquake Island.

A $10,000 prize lures Tom into competing at a local aviation meet at Eagle Park. Tom is determined to build the fastest plane around, but his plans mysteriously disappear, which means Tom must redesign his new airplane from the beginning.

The Pollard is about to be taken to Anapolis, where the United States Navy will train their midshipmen how to run the submarine. Jack, Hal and Eph are all to help with training and to see the sights in Anapolis. They might even persuade the Navy to buy the second submarine, the Farnum. (Ann Boulais)

Jack Benson and Hal Hastings arrive in Dunhaven, looking for adventure. But in a sleepy, little town, they might not find much. When they find out that there is a submarine in the shipyard, they decide that this is what they have been looking for.

The torpedo submarine's inventor, Jack Farnum, is looking for investors to help him kick his new shipyard into high gear. He already has his crew set, with sixteen year old Jack Benson as the captain, and his friend Hal Hastings running the engines. But, there may be some changes to the crew of the Pollard on the horizon.

Captain Jack Benson and Hal Hastings have been sailing in torpedo submarines a while now. But, there is new danger that they will have to get used to, having the actual torpedoes onboard! They will be trying out a new boat, named after Hal, with the Navy watching closely. But trouble is always close by. (Ann Boulais)

It is a wonderful December day in Spruce Beach, FL, and everyone is waiting, waiting for something special that has been promised. The "Benson", the fast submarine built by the Pollard Submarine Boat Company, is set to arrive. But, there are more people who are interested in the "Benson" than those picnicking on the beach. Who could they be? (Ann Boulais)