I loved the first 2 volumes just under the 3 rd because in the end you get a bit tired of always the same dialogue, the problems remain the same, etc.
But we still want to read them, and I arrive at the end of the third and I already know that I will command the 4th.
I find that there is not enough action, not enough twists, I read this saga after 50nuances I found richer puzzles etc ... I saw that the rights were bought Adaptation to the tv I look forward to see what it can give to the screen) because the characters are really engaging with their pots they drag.
Here I recommend reading more because it advances the more it become addictive!