Actually, the film's female lead character, Tania Chernova, was interviewed in person by the author, William Craig, some 30 years ago. I was quite surprised that the true life Tania was actually MORE action-oriented than the film version! So the film made her into a more passive, conventional movie heroine, rather than the sniper killer that she actually was.
Aside from movie comparisons, this was a gripping book that I couldn't stop reading. The first half focuses on the actual battle in the city of Stalingrad, which captures the feel of the movie. The second half of the book focuses on how the German army got defeated, when the battle shifted outside of the actual city, in the snow covered, open fields and plains, focusing on the German inner politics that would eventually lead to the defeat of the German army. Most of the second half of this book is not shown in the movie at all.
Overall, I was surprised that some of the more unbelievable, yet dramatic moments from the film were actually true, while even more "extreme" details of the real life people were not used at all. I am glad that I read this book, which is definitely one of the most famous accounts of the battle for Stalingrad, but the book is definitely NOT for folks who are mainly interested about what happens in the movie version only.