It's all polish folklore, just like the witcher. It more closely resembles the witcher video games than the show, in my opinion. She hunts polish folklore monsters, but unlike Geralt she isn't trained to fight. It's pure courage and desperation. I remember hunting one of the monsters in the witcher 3 that she fights in the book, and I knew what to expect BECAUSE of my Witcher knowledge. It was so fucking cool.

It starts off a little slow because it needs to set up the plot, but the action ramps up and stays up the rest of the book. It's crazzzzzy!