Don Winslow of the Navy #48

Don Winslow volunteers to pilot an untested plexiglass globe to the ocean's deepest, most treacherous depths—over six miles down—to investigate mysterious seismic tremors that could threaten the world. Aboard Professor Riccard's experimental vessel, Winslow must brave crushing pressure and the dangers of the deep itself to uncover what's causing the disturbances on the ocean floor. It's a mission no man has attempted before, and failure could mean the globe—and its pilot—never return to the surface.

When Navy troubleshooters Don Winslow and Red Pennington investigate a series of ship sinkings at Jensen & Corbett, they uncover a bitter dispute between the two business partners and decide to arrange a peaceful yacht outing to help them settle their differences. But what begins as a calm discussion at sea takes a sinister turn when one partner suddenly falls ill, and Winslow must piece together the clues before a calculated murder scheme succeeds.

Jetsam Joe strikes it rich with a diamond in South Africa, but when crooks close in, he hides the gem by painting it black and burying it in a coal pile—only to discover he's made finding it again nearly impossible. With the Captain breathing down his neck and the crooks still prowling, Joe must figure out how to recover his fortune before it's too late.

Don Winslow and his partner spring into action when a foreign dignitary—Pedro Jolivar, Bargonia's Secretary of State—arrives for an official visit, only to become the target of a vengeful plot involving a specially rigged camera that doubles as a weapon. With Don's quick thinking and keen eye, he must track down the conspiracy before an unsuspecting young photographer becomes an unwitting assassin at a Navy dinner. It's a tense race against time to disarm a killer's scheme and protect an innocent kid from becoming a murderer.