Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.

Ruthless Austrian entrepreneur Edward Bolcke has managed to steal a crucial component of the U.S. Navy's latest submarine technology -- and he has found a way to hijack the world's supply of rare earth minerals. The three Pitts, along with longstanding sidekick Al Giordino, use their usual mix of brains and brawn to see that justice is served.

Purports to be the journal of Zoticus de Lesseps, written on an ill-fated 1863 voyage accompanying Captain Nemo to explore the mysteries of the deep sea.

In Paris, a graduate student in a secret laboratory reveals a powerful new technology to a beautiful and mysterious woman. A few hours later, the student is drugged and dumped in a river. Radical environmental terrorists are launching a fanatical campaign--and the very future of the world they seek to protect may be at stake. Only MIT scientist and federal agent John Kenner can stop the deadly plot before the terrifying consequences are realized--and...

A nineteenth-century science fiction tale of an electric submarine, its eccentric captain, and undersea world, which anticipated many of the scientific achievements of the twentieth century. The adventures of a French scientist and his companions who travel the seven seas in the mid-nineteenth century as prisoners in the submarine of the mysterious Captain Nemo.

In the summer of 1851, with encouragement and ideas provided by his family, an inventor builds a working submarine and takes his family for a ride. Includes notes about Lodner Phillips, the real inventor on whom the story is based.

After a decade-long secret military build-up, China launches a sneak attack on the U.S. Pacific fleet in this thrilling sequel to The Trident Deception.