Striking the Balance — Harry Turtledove

THE FATAL DEADLINE ARRIVES.
THE SMASHING FINALE UNFOLDS.
THE LAST-DITCH EFFORT TO AVERT ATOMIC OBLIVION.

At the height of World War II, the deadliest enemies in all of human history were forced to put aside their hatreds and unite against a seemingly invincible power. With awesome technology, the aggressors swept across the planet, sowing destruction.

City after city has exploded in radioactive firestorms. Fear has continued to mount as life-sustaining resources disappear.

While Mao Tse-tung wages a desperate guerrilla war and Hitler drives his country toward self-destruction, United States forces frantically try to stop the enemy's push from coast to coast. Yet to win this battle and stave off world domination, these once-great military powers may have to risk the annihilation of the human race...