There are three separate series set in the same universe, with Season 1 pulling from the first Shadow and Bone book and setting up a prequel for the Six of Crows book.

All of the different Grishaverse series can technically be read independently, but they’re set in the same universe and have some character crossover, so I ~personally~ recommend reading them all! As someone who has read the books, I still very much enjoyed the show despite knowing what was going to happen (for the most part).