Iceberg by Clive Cussler

Frozen inside a million-ton mass of ice -- the charred remains of a long-missing luxury yacht, vanished en route to a secret White House rendezvous. The only clues to the ship's priceless -- and missing -- cargo: ornately carved rings and the horribly burned bodies of its crew.
DIRK PITT, intrepid hero of Clive Cussler's smash best sellers Dragon, Sahara, and Inca Gold, confronts the most lethal network of intrigue and murder in his war against international crime. Only his strength, skill and daring can thwart a supercharged scheme that could blow every fuse on earth!

Zimmerman's Algorithm

The breakout novel that puts S. Andrew Swann in the techno-thriller ranks of Clancy, Coonts, and Cussler!
Veteran writer S. Andrew Swann turns his talents to a mainstream techno-thriller that combines the authentic detail of Tom Clancy, the global intrigue of Jack Higgins, and the sheer adventure of Clive Cussler.
Gideon Malcolm was a Washington DC cop who stumbled into the midst of a high-level sting operation gone wrong and nearly paid with his life. Now he wants answers. But the government wants him to forget the whole thing. Yet Gideon wasn't about to give up....