Fifty by Eldon Kellogg

A rogue general within China’s People’s Liberation Army has a 25-year plan to smuggle nuclear weapons into the United States. Lieutenant General Kung
Yusheng has been the Commander of 22 Base, the secret underground repository of China’s nuclear arsenal, for over 30 years. He is a collector of artifacts owned
by famous military leaders, loves American art, and would like nothing better
than to bring the United States to its knees.

When a nuclear weapon is discovered in San Francisco, it leads to a wild search
in the United States for more of the devastating devices, even as a 10-megaton thermonuclear weapon is delivered, and hidden, less than seven miles from the White House.