Worldwar 2: Tilting the Balance  (English, Paperback, Turtledove Harry)

The war between humans judders to a halt as Germany, Russia and all the great military powers scramble to meet an even deadlier foe. The aliens' formidable tehnology makes their victory seems inevitable. Already, Berlin and Washington have been wiped out by nukes, and large parts of the USA and the Axis territories lie under the invaders' control. Yet humanity refuses to surrender so easily. Its resistance fighters become fiendishly clever, ruthleses at finding and exploiting the weaknesses of their foe. 'The wizard of If.' Chicago Sun-Times 'The standard-bearer for alternate history.' USA Today