It might deserve 5 stars, but just in case.
I have enjoyed the fourth part of Kendra and Seth’s adventures four times more than in the beginning. Besides the mastery of the author, I love the fact that this story shows the potential in adolescents, and how, despite underestimation, protection and limitations from adults, they manage to do enough to kind of solve problems that even overcome adults, like they just need to trust in themselves and think of consequences, then they can save the world.

But yeah, I’m so sad for the deaths, Seth got what he deserves, he is a good boy, and (omg) the enemies are so admirable and fearsome. I’m already starting the next and final part, things for the siblings are so complicated now.