u/Joel-Miller-TLOU

The book was white with a blood splatter on the cover, it was very violent with The main character bit someone’s ear off at one point and the final fight was in a zoo, the title was used in the sentence a wave of (blank) washed over him. I need to find the name of this book. This is a very obscure book that my dad found in a charity shop and was not seen again after my holiday. There is a spoiler but it only matters if you know the book