Flight of the Condor — Richard P. Henrick

PERLUDE TO DOOMSDAY
KEYHOLE ALPHA, America's most advanced defensive surveillance satellite, is abandoning its orbit, and returning rapidly and irreversibly to an unsuspecting Earth. In a matter of a few terrifying hours, the world's most powerful nation will become susceptible to a devastating surprise attack from its Soviet enemy.
As the deadly Russian war machine secretly arms itself to deliver a lethal nuclear blow, the fate of humanity will be determined on two separate battlefields thousands of miles apart … beneath the ocean, where the valiant crew of the assault submarine USS Razorback prepares for mankind's ultimate confrontation, and in the silent reaches of outer space. The United States must take one last, desperate stand, gambling all on the final journey of the obsolete and dangerous space shuttle called Condor.