I just finished the first book and liked it. Because I'm writing my first novel, I wanted to see how I compared and was shocked to see how similar we are. I was more interested in how she handled her dialogue, how she moved her characters from one situation to the next, and what connecting devices she used.
If you analyze the first book, it starts out slowly, but sets the initial mystery, a question that must be answered. Each devise gets the reader closer and closer, but also builds the tension. She handles it quite well. The first movie was good, but the book was better.