Crooked Kingdom

But the sequel was EVERYTHING.
I didn't love Six of Crows, but it kept my attention long enough to want to read the sequel. And boy was I glad I did.
I didn't love the lack of character growth in the first book, but the second met my expectations there. It was equally action-packed and emotional, and it had closure at the end but enough to think about the possible future.
I ended up in love with the characters and the universe by the end and can't wait to dive into the rest of the Grishaverse and read more.