Some of my favorite books (in no particular order) 

Fire and Ice Series 

Need I say more?  The books are only slightly different form the show but there is so much more detail and story behind each of the characters. 

Abe Lincoln, Vampire Hunter 

The movie is HORRIBLE compared to the book. It is basically history and where ever there were gaps or lack of records, the genius author filled in vampires. 

Night Watch (Noichnoi Dozor) 

This Russian novel is pretty awesome if you like trippy shit. I only read the first book which was massive but there are like 3 more in the series. A bit slow at times. If you’ve seen the movies, they cover only HALF of this book. 

The Magicians 

A great book. If you liked Harry Potter- This is the adult version. The sequel is the only book I liked better. 

The Magician King

Sequel to the Magicians. Literally my favorite book.  

The Ritual 

This book was fucking TERRIFYING. Scandinavian forests, goat demons, etc. Sort of Blair Witchy with more depth.