Just seventy-two hours ago, Dirk Pitt was lying in the hot California sun with a beautiful woman, a Scotch-rocks in one hand, but an urgent call from Admiral James Sandecker, his commander at the National Underwater and Marine Agency (NUMA), brings Pitt out of the warm Pacific breezes and straight into a North Atlantic deep freeze. The reason: the dis- covery of a long-missing luxury yacht, en route to a secret White House rendezvous, frozen solid in a mil- lion-ton tombstone o...