The books have different focuses, and will have different blurbs. The first book will have a Science! focused blurb since that's what it contains, and the later ones will have blurbs more appropriate to their content.

Edit: Added

The blurbs should fit the volume. A non-exhaustive list of possible things to emphasize:

• First: science, rationality, agentyness, seeing the world through fresh eyes and strategic thinking.
• Second: seeing the darkness in the world, heroism, caring, psychology, and rationality.
• Third: maturing, realizing the stakes, making difficult moral choices, realizing you're not perfect but still trying, and rationality.