Their magic treehouse 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. Morgan le Fay will make Jack and Annie masters of the tree house if only they can solve four riddles -- which will take four books, of course! Dolphins at Daybreak begins the third set of four books in this magical (and increasingly popular) series! Jack and Annie are off in the Magic...

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...

"Detective Isaac Bell battles foreign spies, German U-boats, and an old nemesis to capture a secret technology that could alter the outcome of World War I in the latest adventure in the #1 New York Times bestselling series from Clive Cussler"--

Still pursued by the evil Count Olaf, the Baudelaire orphans attempt to reach a very important VFD meeting, but first they must travel in a rattletrap submarine to the Gorgonian Grotto, a dangerous underwater cave, in search of the sugar bowl.

"Dirk Pitt, death-defying adventurer and deep-sea expert, is put to the ultimate test as he plunges into the perilous waters of the Pacific Vortex." Pitt's job is to find Starbuck, America's deep-diving nuclear arsenal and salvage it before the sea explodes.

In the final days of World War II, the Japanese launch two submarines carrying a new strain of a deadly virus to the west coast of the United States, but years after the subs are lost at sea, someone plots to use their deadly cargo.

It's out there, under the salt of the Gulf of Mexico, off the Louisiana coast, a buried Nazi submarine. Detective Dave Robicheaux of the New Iberia Sheriff's office has known of its existence since childhood, when he was terrified by nightmares of the evil Nazi sailors just offshore. Then, as a teenager he stumbled upon the sunken sub while scuba diving, but for years he kept the secret of its watery grave. But decades later, a powerful Jewish activist...

"From the very first submarine in 1620 to the defense systems and weaponry used on modern submarines, this book uses diagrams, stories, and dramatic imagery to present a fascinating history of submarines and the technology used to operate them."--Provided by publisher.