Summarize 1st half of the book

I think that the first half of the book was very depressing. First, Sig Andersson, the main character in the book witnessed the death of a lot of people like his father, Einar Andersson, his mother, and a group of people he didn't even know. 

Also, A weird, mysterious person named Wolff who never got along with Sig Andersson, Sig got hit by Wolff and Sig was gushing out blood out of the back of his head but during the end of the book he started to be less afraid of him.

So basically life for Sig Anderson is basically just a big Sad emotional, awful life but hopefully life will start to turn around for him.