The Jetmarine, the second great invention of Tom Swift Jr., takes the young inventor into a desperate battle with bold modern pirates who have been ravaging the sea lanes off our southern coast.

The atom-powered, two-man submarine is launched just in time for Tom and his pal Bud to set out to rescue Tom's father, who has fallen into the hands of the pirates. The wily enemy pulls no punches in trying to wreck the amazing Jetmarine that outspeeds any sub and is able to plunge miles to the ocean floor. Breathtaking running battles through hurricanes and gunfire, thrilling struggles with undersea monsters, imprisonment and escape from the pirate stronghold are part of the excitement of this second book in the new TOM SWIFT JR. series.

From the moment Tom innocently picks up a strange coin imprinted with the head of a dog, things begin happening -- not only to Tom, but also to his father, his uncle, to Bud Barclay, and Chow the cook. The pace continues from the Swift plant at Shopton to the Caribbean -- on and under the sea, in the air and inside the pirates' secret hideout.