I'm looking for an old sci-fi book which I read about 13-15 years ago. Unfortunately there isn't much I recall, only few bits and pieces from the first book:
The story is about Earth being invaded by aliens. An empty ship approaches Earch (similar to RAMA), lands on the North pole, and later aliens start to pour out of it (ship seems to be serving as some kind of "Ark" for teleportation) attacking Earth.
The name of the main character - female, sergeant in the military, is "Four", or at least I recall it as being translated into my language as "Four" (Четири).
Sadly, that's about all I recall from the book. Been searching for awhile trying to find it and/or remember more so I can re-read it but so far my search has been futile.
Does this ring any bell to anyone?